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jfsavage · 11-12-2008, 02:57 PM

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

creampuff · 11-12-2008, 04:37 PM

The Sigma 10-20mm does exhibit hot spots, as does the DA 12-24mm.
The DA 14mm is perfect.

jfsavage · 11-15-2008, 03:49 AM

Originally posted by creampuff

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 ;{

slomojoe · 11-15-2008, 07:25 AM

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?

jfsavage · 11-18-2008, 05:02 AM

Originally posted by slomojoe

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

jfsavage · 11-18-2008, 05:06 AM

Originally posted by creampuff

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.

11-12-2008, 02:57 PM	#1
jfsavage Senior Member Join Date: Jun 2008 Location: Charlotte, NC Posts: 211	Ultrawide zoom recommendation for Infrared Has anyone tried an ultrawide zoom lens such as the Sigma 10-20mm using a converted infrared camera?

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11-12-2008, 04:37 PM	#2
creampuff Veteran Member Join Date: May 2007 Location: Singapore Photos: Gallery Posts: 3,953	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
jfsavage Senior Member Join Date: Jun 2008 Location: Charlotte, NC Posts: 211 Original Poster	Originally posted by creampuff 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
slomojoe Veteran Member Join Date: Mar 2007 Location: Upstate NY Posts: 788	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
jfsavage Senior Member Join Date: Jun 2008 Location: Charlotte, NC Posts: 211 Original Poster	Originally posted by slomojoe 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
jfsavage Senior Member Join Date: Jun 2008 Location: Charlotte, NC Posts: 211 Original Poster	Originally posted by creampuff 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.

Ultrawide zoom recommendation for Infrared

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