HELP: Have you taken Infrared with a K20D?

jfsavage · 08-21-2008, 03:13 AM

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

Tom S. · 08-21-2008, 06:42 AM

The K20D has it's own IR setting. No filter needed.

Spex · 08-21-2008, 07:05 AM

No, it doesn't. It has digital filter that simulates IR effect, but that's not quite the same

Tom S. · 08-21-2008, 12:03 PM

Originally posted by Spex

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?

Spex · 08-22-2008, 11:52 AM

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...

Delgado · 08-22-2008, 01:19 PM

Originally posted by jfsavage

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.

Shashinki · 08-22-2008, 03:34 PM

I wonder where our resident Sigma DSLR commercial guy is when you need him?

08-21-2008, 03:13 AM	#1
jfsavage Senior Member Join Date: Jun 2008 Location: Charlotte, NC Posts: 211	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, 07:05 AM	#3
Spex Senior Member Join Date: Aug 2008 Location: Dubrovnik, Croatia Posts: 216	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.

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08-21-2008, 06:42 AM	#2
Tom S. Veteran Member Join Date: May 2008 Location: S.E. Michigan Photos: Albums Posts: 4,317	The K20D has it's own IR setting. No filter needed.

08-21-2008, 12:03 PM	#4
Tom S. Veteran Member Join Date: May 2008 Location: S.E. Michigan Photos: Albums Posts: 4,317	Originally posted by Spex 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
Spex Senior Member Join Date: Aug 2008 Location: Dubrovnik, Croatia Posts: 216	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
Delgado Forum Member Join Date: Mar 2007 Location: London Posts: 71	Originally posted by jfsavage 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
Shashinki Veteran Member Join Date: Jan 2008 Location: Norway Posts: 355	I wonder where our resident Sigma DSLR commercial guy is when you need him?