Andrea B. Posted May 28, 2021 Share Posted May 28, 2021 I said I would try my KolariU on a non-UV-capable lens.The flower below is a Delosperma (Ice Plant). Reference Visible PhotoD610/fullSpec + UV-Nikkor 104/4.5 + Baader UV/IR-Cut + SunlightConversion in Photo Ninja with D610 profile.f/16 for 1/800" @ ISO-100 Reference UV PhotoD610/fullSpec + UV-Nikkor 104/4.5 + BaaderU UV-Pass + SunlightConversion in Photo Ninja with D610 profile.The petals are UV-bright.The center anthers are UV-dark but not uniformly dark.There is a diffuse, short, central pale blue bull's-eye.f/16 for 1/4" @ ISO-100 Test UV PhotoD610/fullSpec + Nikon 50/1.8 + KolariU UV-Pass + SunlightConversion in Photo Ninja with D610 profile.f/16 for 1/13" @ ISO-400I don't think it is a good idea to compare exposure values (almost the same) because the photos were made on two different days at two different times-of-day with two different focal lengths. We are only looking for IR leak here. Crop 1 from Test UV Photo Crop 2 from Test UV Photo ConclusionNothing looks IR leaky to me with my particular copy of the KolariU when used on a non-UV-capable lens. But I will say that the Nikon 50/1.8 is a really *bad* lens for UV work. The flowers look kind of "glowy". The chromatic aberration is really bad. The lens is not sharp in UV. The flower's blue bull's-eye seems to be missing. Link to comment
Andy Perrin Posted May 28, 2021 Share Posted May 28, 2021 Ouch, that really is a horrid lens for UV work. Apparently there do exist Kolaris that function properly. Well, I guess I enjoyed this ad for the UV Nikkor! Link to comment
Andrea B. Posted May 28, 2021 Author Share Posted May 28, 2021 I'm thinking that Adorama must have had a bad batch of those KolariU filters. Link to comment
Andy Perrin Posted May 28, 2021 Share Posted May 28, 2021 I think you're right, but I also think we should warn people away from their filters unless they want to go through a cycle of return-and-exchange. Plenty of other filters are available. Link to comment
Andrea B. Posted May 28, 2021 Author Share Posted May 28, 2021 I second that idea. I'm going to the Filter Sticky now. Link to comment
Andy Perrin Posted May 28, 2021 Share Posted May 28, 2021 Honestly, Kolari should do a proper recall if they had a bad batch. That is what an automaker does if they make a lemon. Yes, sometimes bad batches happen and they aren't caught in time, but there needs to be some transparency about the issue and a standing offer to replace them, and also a note on the webpage about the problem and resellers should also have the note. Link to comment
Andrea B. Posted May 28, 2021 Author Share Posted May 28, 2021 Totally agree.I posted this in the Filter Sticky. (2) Kolari Vision UV Bandpass Filter 365FWHM40WARNINGWe have seen here on UVP more than once a KolariU UV-pass filter which did not fully suppress IR. Some were bought directly from Kolari Vision and others from camera shops. At this time I must withdraw the KolariU from recommendation until I can determine that the problem has been fixed.Link 1: Kolari Vision UV rednessLink 2: New member's first attempts and questions Link to comment
colinbm Posted May 29, 2021 Share Posted May 29, 2021 Thanks Andrea.I think the warning is a bit out of place & unfair to the seller ........ doesn't the S8612 fix the problem ?Even though the S8612 needs a warning too...... If the filter was used in a pure UVA light source then there is no IR leak. Isn't this a common problem with most UV pass filters, not just to this one particular filter ? Link to comment
Andy Perrin Posted May 29, 2021 Share Posted May 29, 2021 Colin, I strongly disagree that it’s unfair to the seller. These are DEFECTIVE filters not matching the specs claimed (as Andrea proved, hers blocks IR just fine, even with a bad lens.) Link to comment
Cadmium Posted May 29, 2021 Share Posted May 29, 2021 Andrea, I like your second to the top UV shot.I don't see anything wrong with the photos in this topic, except the poor sharpness of some shots, which I guess is due to the lens, not the filter?I have not been following this problem, but has anyone complained to Kolari.I think the thing to do is call them and complain, then send your filter to them for examination and replacement.Then test the replacement. Link to comment
Andrea B. Posted May 29, 2021 Author Share Posted May 29, 2021 I think the warning is a bit out of place & unfair to the seller ........ doesn't the S8612 fix the problem ? Col, think about it. What is the point of buying a UV-pass-only filter if it does not pass UV-only?* I don't want any vendor cheating my members here. The seller has a big problem which they need to clean up promptly.I.e., IR suppression is OD 4.0 or better. Isn't this a common problem with most UV pass filters, not just to this one particular filter ? Most well made UV-pass filters suppress IR to the level of OD 4.0 or better. The BaaderU has one area of suppression at about OD 3.5, the rest beyond that. I think the thing to do is call them [Kolari Vision] and complain, then send your filter to them for examination and replacement.Then test the replacement. That has been done in a couple of cases. We have one documented here from two years ago. If Kolari doesn't know by now in 2021 that they have a problem with their KolariU, then they are being obtuse. Link to comment
Andrea B. Posted May 29, 2021 Author Share Posted May 29, 2021 Link: https://www.ultravioletphotography.com/content/index.php/topic/3416-good-day/ Our member Nemo Andrea mentions his problem with the KolariU in his introduction topic. The faulty filter was replaced by Kolari Vision. This was in August 2019. Link to comment
Cadmium Posted May 30, 2021 Share Posted May 30, 2021 Yes, I see that Nemo Andrea opted for a replacement, but I don't see any info posted about replacement results.Has anyone else received a replacement that resolved their initial result problems?And I am not sure I see anything wrong with your tests above other than could be associated with the lens. Link to comment
Andy Perrin Posted May 30, 2021 Share Posted May 30, 2021 Yes, he reported his results with the new filter here:https://www.ultravioletphotography.com/content/index.php/topic/3538-kolari-vision-filter-update/ After he white balanced properly it seemed to be fine with the new filter. Link to comment
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