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08-21-2008, 03:13 AM   #1
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HELP: Have you taken Infrared with a K20D?

If you have taken any infrared pictures with a K20D, I have two questions I would really appreciate you answering:

1) What filter do you use?
2) What exposure do you typically get on a bright day? (time aperture, ISO)

The reason I am asking is that I have a cheap Opteka IR filter and the fasted exposure I have seen is about 30 seconds, f4.0, ISO 100. To get reasonable depth of field this means that my exposures times are running into many minutes. I have had a post from a K10D user that says they get exposures of 1-3 seconds at f11-13, which is wildly different. So I want to know if the K20D is useless for IR, or if I have a junk IR filter.

Many thanks,

Jonathan

08-21-2008, 06:42 AM   #2
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The K20D has it's own IR setting. No filter needed.
08-21-2008, 07:05 AM   #3
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No, it doesn't. It has digital filter that simulates IR effect, but that's not quite the same

Last edited by Spex; 08-22-2008 at 11:49 AM.
08-21-2008, 12:03 PM   #4
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QuoteOriginally posted by Spex Quote
No, it deosn't. It has digital filter that simulates IR effect, but that's not quite the same
So you don't consider that a setting?

08-22-2008, 11:52 AM   #5
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Not quite, because IR filter is blocking visible light, while K20D's setting is acquiring IR look by in-camera processing of picture taken with visible light. Result may look similar, but it's not real IR. Just to make a difference
Because someone could think that K20D has real IR ability...
08-22-2008, 01:19 PM   #6
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QuoteOriginally posted by jfsavage Quote
If you have taken any infrared pictures with a K20D, I have two questions I would really appreciate you answering:

1) What filter do you use?
2) What exposure do you typically get on a bright day? (time aperture, ISO)
Just as a test without too many cares about the grain I tried a Hoya R72 with a K20 ISO setting of 3200 on a day varying between patchy cloud and overcast. Average exposure was 6 sec at f6.7, but varied a bit either way according to the conditions. Obviously it would be a few stops better on a bright day. I didn't take a tripod and just rested the camera on something solid and flat. It was good enough for a quick test and the grain was better than I had expected. I did get some odd blue streaky artifacts however.
08-22-2008, 03:34 PM   #7
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I wonder where our resident Sigma DSLR commercial guy is when you need him?
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