On Tue, March 26, 2013 10:30 am, Igor Roshchin wrote: > > Interesting. > I thought about converting my *ist DS for a similar purpose. > Somehow I remember somebody mentioning on this list that the DS is > quite suitable for that role (or am I mixing it with the suitability > for astro-photography?). > If somebody can comment on that aspect of conversion, and what is > involved, I'd appreciate.
I don't know about the *ist, but the K100 had a very weak IR filter. I used to do a lot of photos using IR filtered flashes in conjunction with the K100D and just overpower the IR filter without blinding the dancers. > > It looks interesting. I am glad I've seen this gallery. It seems to > boost the effective sensitivity. > What I am not sure about is if I like the way it looks overall. Much of my previous IR work has been converted to B&W. It has some interesting effects. One woman said she liked an IR portrait I did of her because skin blemishes don't show up in IR. You have to be careful using IR flashes if a woman is wearing a light cotton shirt and a bra made of synthetics, because the undergarments may show up a lot more vividly than desirable. > > Also, - did you have to offset the focus all the time, or was something > done to the camera at the time of the conversion? I used a flash that let me stop down the lens enough to get sufficient depth of field. I also tried using my array of IREDs to illuminate near objects in IR, so that is what the autofocus would use for focusing. DSLRs that are converted to IR only need to be recalibrated for autofocus. This is a situation where mirrorless (such as the K-01) would work a lot better, because it would set focus based on what the sensor sees. Also with an IR mirrorless camera, if you wanted to put an IR pass/visible block filter on the lens, you'd still be able to see to compose and focus. I chatted with John Jay Li (I pointed you to his blog a couple weeks ago) and he said he shot with IR at a dance event at Dayton a couple weeks back and has ordered an IR D700. I think it's a fascinating technique that isn't always applicable, but very cool for when it does work. > > Igor > > > Sat Mar 23 03:51:53 EDT 2013 > Larry Colen wrote: > > I finally got the chance to borrow a DSLR that has had the IR filter > removed. It's a Rebel XTi. Last night I took it to a weekly dance and > mostly shot using the Canon flash with an IR filter over the flash. It was > my first time using this rig, so I certainly don't have things dialed in. > His 30/1.8 lens is a bit flakey, so I just used the Sigma 17-70. Towards > the end of the evening, I tried using my IRED array as a focus assist. > > The setup has it's own set of advantages and drawbacks. I think that a > K-01, or some other mirrorless camera that has been converted to IR would > do a better job because you could focus based on what's on the sensor. > Likewise you could compose and focus, even with an IR pass/visible block > filter on the lens. > > http://www.flickr.com/photos/ellarsee/sets/72157633067710534/ > > -- > Larry Colen lrc at red4est.com sent from i4est > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > 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 via squirrelmail -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
