Archived posting to the Leica Users Group, 2004/09/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I think I posted a link to info about how to use a digital was an IR camera. You need to heavily filter to cut out most of the visible light and leave only a little red plus the IR. You get an ASA of like 1 or 5 or something. LONG exposures. Ah - here's a site although it doesn't look like the site i posted: <http://dpfwiw.com/ir.htm> Adam On Mon, 6 Sep 2004 11:33:29 -0400, Dan Post <dpost@triad.rr.com> wrote: > Other Dan- > I agree with you- the de-colorization of a digital image is great for > generating B&W! I played around with my Leica Digilux Zoom (spent all my > ducats on an M7 so I have to wait a while for the 'biggie'digital!) and > found that by eliminating all but the red channel- that I had a nearly IR > photo. I imagine it was pretty close as the CCD is sensitive to IR in that > I > looked at the IR LED on the VCR flinker, and the otherwise invisible beam > shows up as a pale blue in the Digilux viewfinder. > I would be interested to know what the full spectral response might be as > the IR effect of shooting and keeping only the red information works pretty > well. > I did try shooting through a Leitz IR filter (looked about the equivaent of > an 87C- very deep red- and of course got zip, zilch, nada for my effort. > :o( > > If the future is digital, think of the possibilities of shooting in the UV > and Near UV spectrum, and taking IR photos as a regular course--- I am > pretty sure that folks like astronomers already do this with the CCD > devices > they use- The Three College Observatory near here has published some really > neat timed exposures (5 minutes!- sharp with no camera shake!) of deep > space > objects outside the visible spectrum. I guess they are 'false' color, but > they are simply beautiful. I can see why amateur astronomy is so popular! > > Dan(Wistfully thinking about what Santa might bring...)Post >