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01-28-2011, 09:31 PM   #1
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How well does the Pentax DA12-24mm work for IR?

My 16-45 is bad with IR, making a hotspot in the middle of the image. Had to buy a 18-55 kit lens to get good results. Will the 12-24 have hotspot problems doing B&W infrared? Would like a wider lens for IR (12-24 is on way). Don't want to pay for a 77mm IR filter if its not going to work well.

thanks
barondla

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01-29-2011, 06:40 AM   #2
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Here is a link to Pentax-world discussion about 12-24 and iR.Vevey in infrared
01-29-2011, 07:07 AM   #3
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You may already know this, those are done with a modified camera. There's a world of difference between using a modded camera and an IR filter on a non modified camera. The actual lens used doesn't matter as much.

K20d Infrared - a set on Flickr



01-29-2011, 07:38 AM   #4
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His comment about the 12-24 seemed interesting and maybe helpful to OP.
I could not really see anything wrong with the lens performance from his examples. I have not used the 12-24 for IR due to filter cost, only the kit and SMCA 50 f1.7 witch performs very well.


Last edited by Ex Finn.; 01-29-2011 at 07:43 AM.
01-29-2011, 08:47 AM   #5
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QuoteOriginally posted by Ex Finn. Quote
His comment about the 12-24 seemed interesting and maybe helpful to OP.
I could not really see anything wrong with the lens performance from his examples. I have not used the 12-24 for IR due to filter cost, only the kit and SMCA 50 f1.7 which performs very well.
Maybe.. I'm not saying it isn't. I was just pointing that out because with a modded camera, no filter is needed and you can shoot as you normally would. Without screwing with a tripod, long exposures, the noise that comes with the method on less than perfect exposures, etc. The lens becomes far less important.

I will note that with my DA12-24 even on a normal camera, over-exposed areas seem to be more of a factor sometimes. Perhaps due to flaring. Also as many others have noted, it isn't the best in the world when it comes to PF. That, in my experience, is the case with Any UWA though. For the cost of a good 77mm IR filter, you can probably find a decent prime and use an existing IR filter with that. The Zenitar 16mm FE is a fun lens to use with IR for example. Never tried it with a non modded camera though (for IR).

01-29-2011, 10:29 AM   #6
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Well I have tested quite a number of lenses for hotspotting and it doesn't really matter if one uses the lens on a IR modded or a regular camera with an IR filter screwed on. The difference of a converted camera is much better sensitivity which equates to quicker exposure times which allows you to hand hold or freeze subject movement.

The DA 12-24mm does have a hotspot. Not as prominent as the DA 16-45mm but it is there. Same with the Sigma 10-20mm (variable aperture model). The DA 14mm and the DA 15mm Limited don't have any hotspots. The DA 17-70 and the DA 18-55mm (all versions) are hot spot free as well.
02-07-2011, 08:10 PM   #7
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I have a modded K100D, and I sometimes get a hotspot with the 12-24 when I use f/5.6 or smaller. My friend has a modded *ist-D, and he had a hotspot even at f/4. It's still my favorite lens to use with the IR camera, though...
02-07-2011, 10:23 PM   #8
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Interesting info. Bought the 12-24. Might add the IR filter later. No rush since its winter here and not sunny.

So of the Pentax wide zooms the 17-70 is likely the best in IR image quality without a hotspot? Interesting.

thanks
barondla

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