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11-12-2008, 02:57 PM   #1
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Ultrawide zoom recommendation for Infrared

Has anyone tried an ultrawide zoom lens such as the Sigma 10-20mm using a converted infrared camera?

11-12-2008, 04:37 PM   #2
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The Sigma 10-20mm does exhibit hot spots, as does the DA 12-24mm.
The DA 14mm is perfect.
11-15-2008, 03:49 AM   #3
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QuoteOriginally posted by creampuff Quote
The Sigma 10-20mm does exhibit hot spots, as does the DA 12-24mm.
The DA 14mm is perfect.
I was intending to get something a little wider than the 14mm. I have the 16-50, so the 14 does not change the view as much as I would like ;{
11-15-2008, 07:25 AM   #4
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Is there a list of IR-suitable lenses for Pentax somewhere? I keep hearing that the kit lens is good, and the 18-250 workable, but not much beyond that. Anything else?

11-18-2008, 05:02 AM   #5
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QuoteOriginally posted by slomojoe Quote
Is there a list of IR-suitable lenses for Pentax somewhere? I keep hearing that the kit lens is good, and the 18-250 workable, but not much beyond that. Anything else?
I've been looking for a list like that as well. The best I can find is DPanswer: Digital Infrared Resource page
11-18-2008, 05:06 AM   #6
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QuoteOriginally posted by creampuff Quote
The Sigma 10-20mm does exhibit hot spots, as does the DA 12-24mm.
The DA 14mm is perfect.
I've heard differing things - from Convert your Digital SLR to Infrared

ACS report that they have found the Sigma 10-20mm causes hotspots on Canon and Nikon cameras. I had no problem with the Sigma on my Pentax.
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