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infra-red photography

Discussion

5 replies
Posted by Yoli Jolliff on January 2, 2010 at 3:38 PM
this is second posting....finally got the image posted then it disappeared. Trying again.
I have been playing around with infra-red photography with my Canon PowerShot SD1000. I tested it with my TV remote and find it is infra-red capable. Using a Hoya R72 filter and a tripod. I keep getting a bright spot in the center of the image, it looks like it might be 2 stops over-exposed. I have cleaned the camera lens and the filter. The spot is still there. I have a sample picture but having problems adding to this post. Picture has not been changed to B/W. Will try again. Any suggestions to correct this will be much appreciated.
Yoli
Posted by Kelly Rowe on January 2, 2010 at 3:54 PM
Looks like a bad coating application in the manufacturing process. Can you exchange it for another filter? Can you put it on another camera and test it?
Posted by Yoli Jolliff on January 2, 2010 at 4:02 PM
thank you, never thought of trying in on a different camera. Need to see if another camera is IR capable. Will try.
Posted by Paul Wegemann on January 2, 2010 at 5:54 PM
It'a an IR hotspot. This is typical of IR photography. Most lenses are made to focus visible light, not infrared, and the coatings used in modern lenses are there to improve the visible spectrum and remove reflections in the visible spectrum. Several of my lenses behave this way on my IR converted camera. Most of my L lenses are fine though. Google on this and you'll see lots of talk about this subject.
The best way to deal with this is to try another camera/lens combo, or brush up on your post processing skills.
Posted by Yoli Jolliff on January 2, 2010 at 6:02 PM
thank you, I will Google discussions on this. I don't do a lot of photo editing...convert to b/w, cropping. Just the simple stuff.
Posted by Kelly Rowe on January 5, 2010 at 11:53 AM
Good to know, Paul. I shoot IR frequently but usually with a 16-35L or 24-70L on a 1DMkIII body, using a Heliopan Infrarot 780. Never saw anything like this before.