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06-16-2021, 12:31 PM   #1
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Infrared Filter

I decided to try Infrared Filter and suddenly ran into a problem. Flare in the center of the frame. Do you think this is a filter defect?

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06-16-2021, 01:27 PM   #2
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Chances are, it's the lens you're using. This is a common issue with some photo lenses and your second photo is a good example of what you would see. I would try an alternate lens and see if the issue still persists. Kolarivision, who does camera IR conversions, has a list of troublesome and non-troublesome lenses on its website:

Lens Hotspot Database - Kolari Vision

You might find your lens listed there but in any case, I doubt that it's the infrared filter's fault. I've used Zomei filters with no problems, and think you're changing the main lens will solve the issue.
06-16-2021, 01:37 PM   #3
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Yep, I second the hotspot vote. I had similar issues with a neewer ir filter, can't remember which lens it was. I very nearly threw the filter away
06-16-2021, 02:58 PM   #4
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As the others have stated, try a different lens (although I am surprised a prime lens like the FA 50mm f1.4 has problems with IR).

06-16-2021, 05:16 PM   #5
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QuoteOriginally posted by othar Quote
As the others have stated, try a different lens (although I am surprised a prime lens like the FA 50mm f1.4 has problems with IR).
Strangely, it is on the Kolari "good" list as well.


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06-16-2021, 05:21 PM   #6
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FWIW, the notched outline of the iris opening is visible in the photo of the grass.

Might this be flare? Was a hood attached?


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06-17-2021, 01:40 AM   #7
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QuoteOriginally posted by Bob 256 Quote
Chances are, it's the lens you're using. This is a common issue with some photo lenses and your second photo is a good example of what you would see. I would try an alternate lens and see if the issue still persists. Kolarivision, who does camera IR conversions, has a list of troublesome and non-troublesome lenses on its website:

Lens Hotspot Database - Kolari Vision

You might find your lens listed there but in any case, I doubt that it's the infrared filter's fault. I've used Zomei filters with no problems, and think you're changing the main lens will solve the issue.
Thank you for such a helpful and quick response. I could not even imagine the existence of such a problem

---------- Post added 06-17-21 at 01:41 AM ----------

QuoteOriginally posted by stevebrot Quote
FWIW, the notched outline of the iris opening is visible in the photo of the grass.

Might this be flare? Was a hood attached?


Steve
No, there was no hood. and flares too. The shooting was carried out in the pre-sunset time and it was cloudy

06-17-2021, 05:53 AM   #8
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The Kolari database is a good reference but not entirely accurate. I had an Oly lens that had horrible hotspots in the center but was listed as a good lens on their list.
06-17-2021, 08:37 AM   #9
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Or maybe there is the same quick information about another problem with the filter? Cross when using a variable density filter
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