Re: IR Photography
What Dave said. I was sorry to lose this capability when i sold the last of my *ist ds Paul > On Jul 18, 2023, at 1:14 PM, David J Brooks wrote: > > I found my istD made for a great ir camera with the Hoya r72 filter > > Dave > >> On Thu, Jul 13, 2023 at 10:10 PM wrote: >> >> That's a very fine image, Ralf - I might try that myself. My *ist-D has >> been sitting on the shelf for most of the last seven years, it will be nice >> to fire it up again. >> >> >> John in Brisbane >> >> >> >> -Original Message- >> From: Ralf R Radermacher >> Sent: Thursday, July 13, 2023 6:13 PM >> To: pdml@pdml.net >> Subject: Re: IR Photography >> >>> Am 13.07.23 um 01:59 schrieb Larry Colen: >>> >>> You'll need to focus based on the live view, which is what the sensor >> sees, either that or manually focus based ton the distance scale and the >> little red dot that shows the IR focus point. >> >> Maybe even a little beyond the red dot which is calibrated for an IR >> wavelength of around 750 nm corresponding to the usual near-infrared film >> stock like Ilford SFX200 or Konica 750. The infrared sensitivity of a DSLR >> sensor extends way beyond that, well into the 800's, shifting the focus >> point even more. >> >> And don't try to step down beyond f8 to gain more DOF. Aperture >> diffraction at IR sets in a lot sooner than with visible light. >> >> I've been using a #87 gelatine filter on my unmodified *istDS. This filter >> is almost completely impervious to visible light. >> >> Here's an example: >> >> https://www.fotocommunity.com/photo/la-bistade-fotoralfbe/32223101 >> >> Ralf >> >> -- >> Ralf R. Radermacher - Köln/Cologne, Germany Blog : >> http://the-real-fotoralf.blogspot.com >> Audio : http://aporee.org/maps/projects/fotoralf >> Fotos : https://www.fotocommunity.de/user_photos/770012 >> -- >> %(real_name)s Pentax-Discuss Mail List >> To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from >> the PDML, please visit the link directly above and follow the directions. >> -- >> %(real_name)s Pentax-Discuss Mail List >> To unsubscribe send an email to pdml-le...@pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > -- > Documenting Life in Rural Ontario. > www.caughtinmotion.com > http://brooksinthecountry.blogspot.com/ > York Region, Ontario, Canada > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
I found my istD made for a great ir camera with the Hoya r72 filter Dave On Thu, Jul 13, 2023 at 10:10 PM wrote: > That's a very fine image, Ralf - I might try that myself. My *ist-D has > been sitting on the shelf for most of the last seven years, it will be nice > to fire it up again. > > > John in Brisbane > > > > -Original Message- > From: Ralf R Radermacher > Sent: Thursday, July 13, 2023 6:13 PM > To: pdml@pdml.net > Subject: Re: IR Photography > > Am 13.07.23 um 01:59 schrieb Larry Colen: > > > You'll need to focus based on the live view, which is what the sensor > sees, either that or manually focus based ton the distance scale and the > little red dot that shows the IR focus point. > > Maybe even a little beyond the red dot which is calibrated for an IR > wavelength of around 750 nm corresponding to the usual near-infrared film > stock like Ilford SFX200 or Konica 750. The infrared sensitivity of a DSLR > sensor extends way beyond that, well into the 800's, shifting the focus > point even more. > > And don't try to step down beyond f8 to gain more DOF. Aperture > diffraction at IR sets in a lot sooner than with visible light. > > I've been using a #87 gelatine filter on my unmodified *istDS. This filter > is almost completely impervious to visible light. > > Here's an example: > > https://www.fotocommunity.com/photo/la-bistade-fotoralfbe/32223101 > > Ralf > > -- > Ralf R. Radermacher - Köln/Cologne, Germany Blog : > http://the-real-fotoralf.blogspot.com > Audio : http://aporee.org/maps/projects/fotoralf > Fotos : https://www.fotocommunity.de/user_photos/770012 > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from > the PDML, please visit the link directly above and follow the directions. > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- Documenting Life in Rural Ontario. www.caughtinmotion.com http://brooksinthecountry.blogspot.com/ York Region, Ontario, Canada -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
Am 14.07.23 um 04:09 schrieb jco...@iinet.net.au: That's a very fine image, Ralf Thanks. Here's a few more, some on film, some digital: https://the-real-fotoralf.blogspot.com/2013/03/infrarot-3.html https://the-real-fotoralf.blogspot.com/2013/02/infrarot-2.html https://the-real-fotoralf.blogspot.com/2013/02/infrarot.html https://the-real-fotoralf.blogspot.com/2009/08/hauptsache-man-macht-was-daraus.html https://the-real-fotoralf.blogspot.com/2009/08/infrarot-digital.html Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
Unfortunately, you'll have some time. Things went sideways today and I wasn't able to cut or bring it. There are smaller IR flash gels available from b et al But I wanted something I could use with my studio strobes. I hope to be back home around labor day. On July 13, 2023 10:06:12 PM PDT, mike wilson wrote: > >> On 14/07/2023 01:29 Larry Colen wrote: >> Last night I had a chance to come home to get my miata, I was hoping to have >> time to cut it up into pieces to mail to anybody that might want some, > >That's very generous of you. I'll have a think about what I can afford >postage on. >-- >%(real_name)s Pentax-Discuss Mail List >To unsubscribe send an email to pdml-le...@pdml.net >to UNSUBSCRIBE from the PDML, please visit the link directly above and follow >the directions. > -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
> On 14/07/2023 01:29 Larry Colen wrote: > Last night I had a chance to come home to get my miata, I was hoping to have > time to cut it up into pieces to mail to anybody that might want some, That's very generous of you. I'll have a think about what I can afford postage on. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
RE: IR Photography
That's a very fine image, Ralf - I might try that myself. My *ist-D has been sitting on the shelf for most of the last seven years, it will be nice to fire it up again. John in Brisbane -Original Message- From: Ralf R Radermacher Sent: Thursday, July 13, 2023 6:13 PM To: pdml@pdml.net Subject: Re: IR Photography Am 13.07.23 um 01:59 schrieb Larry Colen: > You'll need to focus based on the live view, which is what the sensor sees, > either that or manually focus based ton the distance scale and the little red > dot that shows the IR focus point. Maybe even a little beyond the red dot which is calibrated for an IR wavelength of around 750 nm corresponding to the usual near-infrared film stock like Ilford SFX200 or Konica 750. The infrared sensitivity of a DSLR sensor extends way beyond that, well into the 800's, shifting the focus point even more. And don't try to step down beyond f8 to gain more DOF. Aperture diffraction at IR sets in a lot sooner than with visible light. I've been using a #87 gelatine filter on my unmodified *istDS. This filter is almost completely impervious to visible light. Here's an example: https://www.fotocommunity.com/photo/la-bistade-fotoralfbe/32223101 Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
https://www.eplastics.com/search?keywords=infrared I bought a sheet of the above to make flash filters so that the flash would only transmit IR. Last night I had a chance to come home to get my miata, I was hoping to have time to cut it up into pieces to mail to anybody that might want some, but things came up (Like needing to get a car smogged and registered) and I haven't even started packing and still have an 8 hour drive ahead of me. If people are interested in some chunks, let me know and I'll see if I can cut a piece to carry back in my miata. Otherwise it is a lot less expensive than the thin film filters. It can be a lot of fun to use an IR strobe and photograph a scene where some of the elements, like a sign, are illuminated, then color balance out the IR magenta to black and white. Some of my best shots are here: https://www.flickr.com/photos/ellarsee/sets/72157659850152524/ more here https://www.flickr.com/photos/ellarsee/collections/72157606110993706/ -- Larry Colen l...@red4est.com. sent from Mirkwood -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
And if I ever have another camera converted, I'll go ahead and have the filter completely removed to give me a full-spectrum camera. On 7/13/2023 5:03 AM, Ralf R Radermacher wrote: Am 13.07.23 um 10:22 schrieb Alan C: I'll source a #87 filter and give my dormant K110D a whirl as a dedicated IR camera. The K110D should work. Basically everything before the K10D. Better still, have its built-in IR filter removed. Ralf -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
I watched a video on InfraRed photography that emphasized the utility of shooting when the light is NOT so good; too hot, too harsh, to specular in the middle of the day. Even before Covid, I was having problems getting out and shooting in the golden hours & IR looked like something I could do with the time when I WAS able to go out & shoot. With digital you can get some kind of immediate feedback so it's not like shooting film. I hope it's going to complement my other photography, not replace it. AND I think some of the apparent problem with the focus is the softness of in camera JPEG conversions. AND ALSO ... I'm at the very beginning of the learning curve. Further, I've re-read the explanation about (665nm) IR. I now think it cuts off the color in the blue & green part of the spectrum leaving the spectrum ABOVE 665nm - oranges, reds & invisible InfraRed ... Anyway, I'm still learning. On 7/13/2023 2:53 AM, Alan C wrote: Interesting. To me it is more of an art form than serious photography. Many moons ago I tried a couple of rolls of B/W IR film. Needed a special filter to block out visible light - made a slide on holder from thin cardboard. Exposures were around f8 from about 0.5 to 5 sec (pot luck!) which made a tripod mandatory - still have the very same tripod. Manual guesstimate timing on "B" with a cable release. Focusing was a nightmare because the filter was so dark I had to focus without the filter & then slide it in and adjust to the IR mark on my Supertak 55/2 (which I still have!). Pity I didn't think of Larry's sticky tape astro method to lock the focus. Only 2 or 3 shots out of the 48 were even on the verge of acceptability so that was the end of my adventure. Alan C On 13-Jul-23 04:59 AM, Larry Colen wrote: On Jul 12, 2023, at 7:06 PM, John Sessoms wrote: On 7/12/2023 7:59 PM, Larry Colen wrote: On Jul 12, 2023, at 4:47 PM, John Sessoms wrote: I had my K20D converted to Amplified Color (665nm) IR. Had my first chance to test it out today. Didn't notice they'd reset the default output to JPEG, so I'm going to have to make another test outing. Yeah, that bit me when I took my K20 to burning man after having it repaired. When I got home and started to process the photos I couldn't figure out why they wouldn't adjust properly. First thing I've noticed is it doesn't seem to work very well if it's not bright sunlight. Test shots I took indoors don't show ANY image unless I boost the ISO way high & use high exposure compensation. So you have it blocking all visible light? "IF" I understand what they did, they replaced the regular IR filter with another filter that passes IR below 665nm so that I get visible light PLUS the upper end of the IR spectrum ... ??? You *should* be able to get shots indoors just as you would with a standard camera. IR is supposed to be really good for harsh daylight (shooting in the middle of the day), so I took it out from 1:00 to 3:00 today to photograph a field of sunflowers that are just coming into bloom. I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like everything is really soft (out of focus?) except for stuff out on the horizon. I've got to go out and make another test, but anyone got ideas? You'll need to focus based on the live view, which is what the sensor sees, either that or manually focus based ton the distance scale and the little red dot that shows the IR focus point. The autofocus system focuses for the visual spectrum, but IR focuses differently. H? The K20D has live view? Hmmm, that’s an issue. Maybe take some test shots and look at the preview screen zoomed in. If you photograph under LED or fluorescent light there should be no IR. -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email topdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Larry Colen l...@red4est.com sent from ret13est -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email topdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Vivere in aeternum aut mori conatur -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
Am 13.07.23 um 10:22 schrieb Alan C: I'll source a #87 filter and give my dormant K110D a whirl as a dedicated IR camera. The K110D should work. Basically everything before the K10D. Better still, have its built-in IR filter removed. Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
That's an amazing image, Ralf. I feel inspired. I'll source a #87 filter and give my dormant K110D a whirl as a dedicated IR camera. Alan C On 13-Jul-23 10:12 AM, Ralf R Radermacher wrote: Am 13.07.23 um 01:59 schrieb Larry Colen: You'll need to focus based on the live view, which is what the sensor sees, either that or manually focus based ton the distance scale and the little red dot that shows the IR focus point. Maybe even a little beyond the red dot which is calibrated for an IR wavelength of around 750 nm corresponding to the usual near-infrared film stock like Ilford SFX200 or Konica 750. The infrared sensitivity of a DSLR sensor extends way beyond that, well into the 800's, shifting the focus point even more. And don't try to step down beyond f8 to gain more DOF. Aperture diffraction at IR sets in a lot sooner than with visible light. I've been using a #87 gelatine filter on my unmodified *istDS. This filter is almost completely impervious to visible light. Here's an example: https://www.fotocommunity.com/photo/la-bistade-fotoralfbe/32223101 Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
Am 13.07.23 um 01:59 schrieb Larry Colen: You'll need to focus based on the live view, which is what the sensor sees, either that or manually focus based ton the distance scale and the little red dot that shows the IR focus point. Maybe even a little beyond the red dot which is calibrated for an IR wavelength of around 750 nm corresponding to the usual near-infrared film stock like Ilford SFX200 or Konica 750. The infrared sensitivity of a DSLR sensor extends way beyond that, well into the 800's, shifting the focus point even more. And don't try to step down beyond f8 to gain more DOF. Aperture diffraction at IR sets in a lot sooner than with visible light. I've been using a #87 gelatine filter on my unmodified *istDS. This filter is almost completely impervious to visible light. Here's an example: https://www.fotocommunity.com/photo/la-bistade-fotoralfbe/32223101 Ralf -- Ralf R. Radermacher - Köln/Cologne, Germany Blog : http://the-real-fotoralf.blogspot.com Audio : http://aporee.org/maps/projects/fotoralf Fotos : https://www.fotocommunity.de/user_photos/770012 -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
Interesting. To me it is more of an art form than serious photography. Many moons ago I tried a couple of rolls of B/W IR film. Needed a special filter to block out visible light - made a slide on holder from thin cardboard. Exposures were around f8 from about 0.5 to 5 sec (pot luck!) which made a tripod mandatory - still have the very same tripod. Manual guesstimate timing on "B" with a cable release. Focusing was a nightmare because the filter was so dark I had to focus without the filter & then slide it in and adjust to the IR mark on my Supertak 55/2 (which I still have!). Pity I didn't think of Larry's sticky tape astro method to lock the focus. Only 2 or 3 shots out of the 48 were even on the verge of acceptability so that was the end of my adventure. Alan C On 13-Jul-23 04:59 AM, Larry Colen wrote: On Jul 12, 2023, at 7:06 PM, John Sessoms wrote: On 7/12/2023 7:59 PM, Larry Colen wrote: On Jul 12, 2023, at 4:47 PM, John Sessoms wrote: I had my K20D converted to Amplified Color (665nm) IR. Had my first chance to test it out today. Didn't notice they'd reset the default output to JPEG, so I'm going to have to make another test outing. Yeah, that bit me when I took my K20 to burning man after having it repaired. When I got home and started to process the photos I couldn't figure out why they wouldn't adjust properly. First thing I've noticed is it doesn't seem to work very well if it's not bright sunlight. Test shots I took indoors don't show ANY image unless I boost the ISO way high & use high exposure compensation. So you have it blocking all visible light? "IF" I understand what they did, they replaced the regular IR filter with another filter that passes IR below 665nm so that I get visible light PLUS the upper end of the IR spectrum ... ??? You *should* be able to get shots indoors just as you would with a standard camera. IR is supposed to be really good for harsh daylight (shooting in the middle of the day), so I took it out from 1:00 to 3:00 today to photograph a field of sunflowers that are just coming into bloom. I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like everything is really soft (out of focus?) except for stuff out on the horizon. I've got to go out and make another test, but anyone got ideas? You'll need to focus based on the live view, which is what the sensor sees, either that or manually focus based ton the distance scale and the little red dot that shows the IR focus point. The autofocus system focuses for the visual spectrum, but IR focuses differently. H? The K20D has live view? Hmmm, that’s an issue. Maybe take some test shots and look at the preview screen zoomed in. If you photograph under LED or fluorescent light there should be no IR. -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email topdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Larry Colen l...@red4est.com sent from ret13est -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email topdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
> On Jul 12, 2023, at 7:06 PM, John Sessoms wrote: > > > > On 7/12/2023 7:59 PM, Larry Colen wrote: >>> On Jul 12, 2023, at 4:47 PM, John Sessoms wrote: >>> >>> I had my K20D converted to Amplified Color (665nm) IR. >>> >>> Had my first chance to test it out today. Didn't notice they'd reset the >>> default output to JPEG, so I'm going to have to make another test outing. >> Yeah, that bit me when I took my K20 to burning man after having it >> repaired. When I got home and started to process the photos I couldn't >> figure out why they wouldn't adjust properly. >>> >>> First thing I've noticed is it doesn't seem to work very well if it's not >>> bright sunlight. Test shots I took indoors don't show ANY image unless I >>> boost the ISO way high & use high exposure compensation. >> So you have it blocking all visible light? > > "IF" I understand what they did, they replaced the regular IR filter with > another filter that passes IR below 665nm so that I get visible light PLUS > the upper end of the IR spectrum ... ??? You *should* be able to get shots indoors just as you would with a standard camera. > >>> >>> IR is supposed to be really good for harsh daylight (shooting in the middle >>> of the day), so I took it out from 1:00 to 3:00 today to photograph a field >>> of sunflowers that are just coming into bloom. >>> >>> I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like >>> everything is really soft (out of focus?) except for stuff out on the >>> horizon. >>> >>> I've got to go out and make another test, but anyone got ideas? >> You'll need to focus based on the live view, which is what the sensor sees, >> either that or manually focus based ton the distance scale and the little >> red dot that shows the IR focus point. The autofocus system focuses for the >> visual spectrum, but IR focuses differently. > > H? The K20D has live view? Hmmm, that’s an issue. Maybe take some test shots and look at the preview screen zoomed in. If you photograph under LED or fluorescent light there should be no IR. > > > -- > Vivere in aeternum aut mori conatur > > -- > This email has been checked for viruses by AVG antivirus software. > www.avg.com > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Larry Colen l...@red4est.com sent from ret13est -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
On 7/12/2023 7:59 PM, Larry Colen wrote: On Jul 12, 2023, at 4:47 PM, John Sessoms wrote: I had my K20D converted to Amplified Color (665nm) IR. Had my first chance to test it out today. Didn't notice they'd reset the default output to JPEG, so I'm going to have to make another test outing. Yeah, that bit me when I took my K20 to burning man after having it repaired. When I got home and started to process the photos I couldn't figure out why they wouldn't adjust properly. First thing I've noticed is it doesn't seem to work very well if it's not bright sunlight. Test shots I took indoors don't show ANY image unless I boost the ISO way high & use high exposure compensation. So you have it blocking all visible light? "IF" I understand what they did, they replaced the regular IR filter with another filter that passes IR below 665nm so that I get visible light PLUS the upper end of the IR spectrum ... ??? IR is supposed to be really good for harsh daylight (shooting in the middle of the day), so I took it out from 1:00 to 3:00 today to photograph a field of sunflowers that are just coming into bloom. I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like everything is really soft (out of focus?) except for stuff out on the horizon. I've got to go out and make another test, but anyone got ideas? You'll need to focus based on the live view, which is what the sensor sees, either that or manually focus based ton the distance scale and the little red dot that shows the IR focus point. The autofocus system focuses for the visual spectrum, but IR focuses differently. H? The K20D has live view? -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: IR Photography
> On Jul 12, 2023, at 4:47 PM, John Sessoms wrote: > > I had my K20D converted to Amplified Color (665nm) IR. > > Had my first chance to test it out today. Didn't notice they'd reset the > default output to JPEG, so I'm going to have to make another test outing. Yeah, that bit me when I took my K20 to burning man after having it repaired. When I got home and started to process the photos I couldn't figure out why they wouldn't adjust properly. > > First thing I've noticed is it doesn't seem to work very well if it's not > bright sunlight. Test shots I took indoors don't show ANY image unless I > boost the ISO way high & use high exposure compensation. So you have it blocking all visible light? > > IR is supposed to be really good for harsh daylight (shooting in the middle > of the day), so I took it out from 1:00 to 3:00 today to photograph a field > of sunflowers that are just coming into bloom. > > I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like > everything is really soft (out of focus?) except for stuff out on the horizon. > > I've got to go out and make another test, but anyone got ideas? You'll need to focus based on the live view, which is what the sensor sees, either that or manually focus based ton the distance scale and the little red dot that shows the IR focus point. The autofocus system focuses for the visual spectrum, but IR focuses differently. > > -- > Vivere in aeternum aut mori conatur > > -- > This email has been checked for viruses by AVG antivirus software. > www.avg.com > -- > %(real_name)s Pentax-Discuss Mail List > To unsubscribe send an email to pdml-le...@pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Larry Colen l...@red4est.com sent from ret13est -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
IR Photography
I had my K20D converted to Amplified Color (665nm) IR. Had my first chance to test it out today. Didn't notice they'd reset the default output to JPEG, so I'm going to have to make another test outing. First thing I've noticed is it doesn't seem to work very well if it's not bright sunlight. Test shots I took indoors don't show ANY image unless I boost the ISO way high & use high exposure compensation. IR is supposed to be really good for harsh daylight (shooting in the middle of the day), so I took it out from 1:00 to 3:00 today to photograph a field of sunflowers that are just coming into bloom. I had it at F8 using the SMC Pentax-DA 1:1.8 50mm lens it seems like everything is really soft (out of focus?) except for stuff out on the horizon. I've got to go out and make another test, but anyone got ideas? -- Vivere in aeternum aut mori conatur -- This email has been checked for viruses by AVG antivirus software. www.avg.com -- %(real_name)s Pentax-Discuss Mail List To unsubscribe send an email to pdml-le...@pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
