Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
Larry, First of all, 20/1.8 with x1.4 will be close to f/2.5 if I am doing the math right at this ungodly early hour. SEcond, while I don't have experience with Tamrox TCs, I have been happily using Pentax's MF 2x-S and AF x1.7. I just wanted to remind that the TCs can also be used with a macro lens, making it super-macro. Here is what DAF 100-MACRO with 2x-s and AF-1.7 stacked together can do with a raspberry: http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9609.jpg http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9608.jpg Igor On 29 August 2010 00:47, Larry Colen lrc at red4est.com wrote: I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
On Aug 30, 2010, at 4:40 AM, Igor Roshchin wrote: Larry, First of all, 20/1.8 with x1.4 will be close to f/2.5 if I am doing the math right at this ungodly early hour. It's kind of silly to put a 1.4x on a 20 rather than just using my 30, or just using the 20 on my aps-c. The 1.4x would be for my longer lenses, though it could be handy for putting on my 16-50 when I'm shooting at the dojo and really need a 24-70. SEcond, while I don't have experience with Tamrox TCs, I have been happily using Pentax's MF 2x-S and AF x1.7. I just wanted to remind that the TCs can also be used with a macro lens, making it super-macro. This conversation reminded me that the TCs that came with the 300/2.8 would work with my tamron adaptall macro, which only goes to 1:2. Here is what DAF 100-MACRO with 2x-s and AF-1.7 stacked together can do with a raspberry: http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9609.jpg http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9608.jpg Very fun. Igor On 29 August 2010 00:47, Larry Colen lrc at red4est.com wrote: I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
On Aug 30, 2010, at 04:40 , Igor Roshchin wrote: Here is what DAF 100-MACRO with 2x-s and AF-1.7 stacked together can do with a raspberry: http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9609.jpg http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9608.jpg Igor Made them big, but made them fuzzy. Joseph McAllister pentax...@mac.com http://gallery.me.com/jomac -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
Mon Aug 30 14:27:54 CDT 2010 Joseph McAllister wrote: On Aug 30, 2010, at 04:40 , Igor Roshchin wrote: Here is what DAF 100-MACRO with 2x-s and AF-1.7 stacked together can do with a raspberry: http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9609.jpg http://www.komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9608.jpg Igor Made them big, but made them fuzzy. Sure. The DOF became extremely shallow. (Also, the small tripod I was using may not be as steady for this sort of job.) It was more of an interesting exercise - to put together two TCs with a macro lens. Igor -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
I have no experience with AF teleconverters, but have the MF Adaptall 2 version of both the 2x and 1.4x that I planned to use with my 52B 90mm f2.5 Macro SP. It will do 1:2 by itself and 1:1 with the 2x, so I believe that means it will do 1:1.5 with the 1.4x. The main advantage of the 1.4x (to me) is that you are losing only a stop of light instead of 2 stops with a 2x. Nice to have when that is a factor. The Sigma EX 10-20mm f4-5.6 will also cover a full 35mm frame, at least down to about 13mm. That probably makes it about the widest rectilinear you can put on a film camera. Need to carve out some time to actually USE all the stuff I've been accumulating. Your 1.4x to 2x image degradation comparison would be interesting to do. Darren Addy Kearney, NE On Sat, Aug 28, 2010 at 11:47 PM, Larry Colen l...@red4est.com wrote: I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Nothing is sure, except Death and Pentaxes. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
On Sun, Aug 29, 2010 at 10:46 AM, CheekyGeek cheekyg...@gmail.com wrote: I have no experience with AF teleconverters, but have the MF Adaptall 2 version of both the 2x and 1.4x that I planned to use with my 52B 90mm f2.5 Macro SP. It will do 1:2 by itself and 1:1 with the 2x, so I believe that means it will do 1:1.5 with the 1.4x. The main advantage of the 1.4x (to me) is that you are losing only a stop of light instead of 2 stops with a 2x. Nice to have when that is a factor. The Sigma EX 10-20mm f4-5.6 will also cover a full 35mm frame, at least down to about 13mm. That probably makes it about the widest rectilinear you can put on a film camera. Need to carve out some time to actually USE all the stuff I've been accumulating. Your 1.4x to 2x image degradation comparison would be interesting to do. Darren Addy Kearney, NE The Sigma 12-24 f4.5-5.6 remains the widest FF rectilinear in most mounts (the other option being the Voigtlander Ultra-Wide-Heliar 12mm f5.6 in LTM, M or F mount). There's also their new 8-16mm version for APS-C but I doubt that covers FF at any focal length. Best deal on a real ultra-wide for FF is the Samyang 14mm f2.8, it's got a bunch of barrel distortion but is extremely sharp (and the distortion is easily corrected in post). It's available in KA form and branded as a Rokinon, Bower, Opteka, Falcon, Samyang and IIRC Vivitar Series 1. -Adam -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
One of the seven warning signs of having too much equipment ;-). This should be easy to test using a nearby brick wall. I'd be curious to hear the results. -Original Message- From: Larry Colen l...@red4est.com Sender: pdml-boun...@pdml.net Date: Sat, 28 Aug 2010 21:47:02 To: Pentax-Discuss Mail Listpdml@pdml.net Reply-To: Pentax-Discuss Mail List pdml@pdml.net Subject: I just found a Tamron -F AF 1.4x teleconverter in my stuff I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
On 29 August 2010 00:47, Larry Colen l...@red4est.com wrote: I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. In response to your original question, Larry, that Tamron 1.4x TC is one of the best around, optically speaking. As far as AF goes, there are two versions, one of which works well with SDM and one which doesn't. The one that does is the MC4 version, which should be printed on the TC body. Because these are no longer manufactured, they go for a pretty penny, and I've seen them sell for $350 or more on eBay. And yet that doesn't seem to be enough of a sign for Pentax to introduce their own 1.4x TC... Any Sigma lens that's DG (not DC) and has an aperture ring will work on manual focus Pentax film cameras. I've used my FA 20mm f/2.8 on an ME Super with good results; I wonder how my Sigma 24mm f/1.8 would work out in low light with 1600 ASA film... I'd need a 16mm f/1.8 on my K10D to match that. Are Pentax making any 16mm f/1.8 primes yet? :-) --M. -- \/\/o/\/\ -- http://WorldOfMiserere.com http://EnticingTheLight.com A Quest for Photographic Enlightenment -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my, stuff
I have a 1.4x Pz-AF MC4 Tamron-F TELE-CONVERTER. I'm not impressed with it as much as I am with the Tamron AF ASPHERICAL LD 28-200 1:3.8-5.6 lens I bought it for. And I'm pretty sure I've mentioned before how disappointing I found that lens. The lens is not sharp and has a lot of CA. The lens + TC is noticeably less sharp and has a lot more CA. Maybe I just got stuck with bad examples, but I wouldn't recommend either one. If you got the TC for free, you didn't pay too much, but otherwise ... The Sigma EX 10-20 1:4-5.6 I have is a DC lens for digital. On my PZ-1p, it vignettes noticeably at 20mm and at 10mm it's like shooting through a porthole. From: CheekyGeek I have no experience with AF teleconverters, but have the MF Adaptall 2 version of both the 2x and 1.4x that I planned to use with my 52B 90mm f2.5 Macro SP. It will do 1:2 by itself and 1:1 with the 2x, so I believe that means it will do 1:1.5 with the 1.4x. The main advantage of the 1.4x (to me) is that you are losing only a stop of light instead of 2 stops with a 2x. Nice to have when that is a factor. The Sigma EX 10-20mm f4-5.6 will also cover a full 35mm frame, at least down to about 13mm. That probably makes it about the widest rectilinear you can put on a film camera. Need to carve out some time to actually USE all the stuff I've been accumulating. Your 1.4x to 2x image degradation comparison would be interesting to do. Darren Addy Kearney, NE On Sat, Aug 28, 2010 at 11:47 PM, Larry Colen l...@red4est.com wrote: I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. ?Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. ?Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: I just found a Tamron -F AF 1.4x teleconverter in my stuff
On Aug 29, 2010, at 8:11 PM, Miserere wrote: On 29 August 2010 00:47, Larry Colen l...@red4est.com wrote: I probably got it when I bought someones bag of gear, saw that it was a TC and just tossed it in the drawer without looking at it. I just tried it out and it seems to work fine on autofocus. Does anyone have any experience with one of these? Would it degrade an image less than cropping it by a factor of 1.4? Another cool realization I had was that my Sigma 20/1.8 will work just fine on a K1000 body that I've got lying around, and it'll give me a view that is wider, and faster, than my 16-50 on the digital body. Albeit, that ASA 400 film doesn't seem to be nearly as good as ASA 400 on the sensor. In any case, it should be fun to play with. In response to your original question, Larry, that Tamron 1.4x TC is one of the best around, optically speaking. As far as AF goes, there are two versions, one of which works well with SDM and one which doesn't. The one that does is the MC4 version, which should be printed on the TC body. Because these are no longer manufactured, they go for a pretty penny, and I've seen them sell for $350 or more on eBay. Yee haw!! 1.4X Pz-AF MC4 ! :-) -- Larry Colen l...@red4est.com sent from i4est -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
