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10-15-2017, 05:40 PM   #1
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The DA 16-85 and Infrared hotspots ?

I have been using a K-01 that I had converted (by Isaac Szabo) for IR use (at 720nm), and I've used it with the DA 15/4 Ltd with some success (and, in fact, my 15/4 lives on the IR K-01). However, I'd also like to try a relatively compact ultra-wide-angle-to-tele zoom on the IR-equipped K-01 (and I don't yet own such a zoom).

I see that the great-for-a-lot-of-other-uses DA 18-135 may invoke IR hotspots (according to the Kolari Vision web site, although there is no specific info there on guilty wavelengths or apertures or focal lengths, or even whether the report(s) of hotspots have been from using lens IR filters or body sensor IR filters). However, I haven't been able to find any reports (positive or negative) about just how the DA 16-85 (which certainly does otherwise seem like a very attractive lens for regular visible light shooting) would work for an IR lens.

So, does anyone have any info regarding using the DA 16-85 as an IR lens that they've gleaned (either personally or second-hand)? Thanks for listening.

DA 15/4 on K-01 --



Last edited by fwcetus; 10-15-2017 at 05:47 PM.
10-16-2017, 02:40 AM   #2
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I prefer to use a standard 18-55 kit lens on my converted K-01, but I also get good results with the 10-17 fisheye. I have used the 16-85 and 18-135 but I think the lenses that give me the results I like are the 18-55 and 10-17. But of course YMMV.
10-16-2017, 06:03 AM   #3
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QuoteOriginally posted by spinno Quote
I prefer to use a standard 18-55 kit lens on my converted K-01, but I also get good results with the 10-17 fisheye. I have used the 16-85 and 18-135 but I think the lenses that give me the results I like are the 18-55 and 10-17. But of course YMMV.

Hi. You said you "have used the 16-85", but did you mean with IR? If so, did you experience any hotspots with it? Thanks.

Last edited by fwcetus; 10-16-2017 at 07:32 AM.
10-16-2017, 10:20 AM   #4
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Sorry meant to say no hotspots with either 16-85 or 18-135. I suspect using a filter in front of the lens is possibly problematic as the exposures are much longer giving the light passing through more opportunity to "misbehave" by bouncing around - with a conversion exposure times are of course more normal.

10-16-2017, 01:04 PM   #5
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QuoteOriginally posted by spinno Quote
Sorry meant to say no hotspots with either 16-85 or 18-135. I suspect using a filter in front of the lens is possibly problematic as the exposures are much longer giving the light passing through more opportunity to "misbehave" by bouncing around - with a conversion exposure times are of course more normal.

Ah, thanks for that clarification.

I am pleased to read your 16-85 report.

I was also pleased but a little surprised about your 18-135 report -- the Kolari Vision site, at Lens Hotspot Database - Kolari Vision (which seems to be the most extensive listing of good and bad IR lenses), lists the 18-135 as having "poor" hotspot performance, but unfortunately the listing is not annotated with any specific information as to why or under what conditions the lenses that were named as "poor" IR lenses actually earned their demerit(s).

Thanks again for providing your feedback.

Last edited by fwcetus; 10-16-2017 at 01:16 PM.
10-16-2017, 03:01 PM   #6
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I understand that far more Canon and Nikon cameras have been converted than Pentax cameras, and so more of their lenses would be used and have a better sample confidence than say one mediocre report on a Pentax lens.
We Pentax owners don't like to boast do we....
I always smile when reviewers bemoan the fact that Pentax lenses don't have shake reduction....well is it always a necessity when SR is in the body. If we all believed the hype how many of us could afford only "the best" (most expensive) cameras.

Last edited by spinno; 10-16-2017 at 03:02 PM. Reason: Missing word
10-16-2017, 04:35 PM   #7
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QuoteOriginally posted by spinno Quote
I understand that far more Canon and Nikon cameras have been converted than Pentax cameras, and so more of their lenses would be used and have a better sample confidence than say one mediocre report on a Pentax lens.
We Pentax owners don't like to boast do we....
I always smile when reviewers bemoan the fact that Pentax lenses don't have shake reduction....well is it always a necessity when SR is in the body. If we all believed the hype how many of us could afford only "the best" (most expensive) cameras.

. And, you and I both know that one of the best cam bodies for IR conversion overall (regardless of brand) is the ~PENTAX~ K-01.

But I digress... Thanks again for your input.
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