What follows are the results from the controlled test taken during a 22 minute test window in identical conditions.
With no filter, 0.6 sec was required to get a 0 EV exposure so that was the pre-filter baseline. All of the filters at MIN were able to do 2 seconds at 0 EV, so review them in the gallery to see how they compare. I then chose 25 seconds for the MAX setting (except on the Bower where I tried 30 sec to avoid a black exposure – unsuccessfully – even at ISO 25,600 @ 30 sec it was still pretty dark).
For the 25 second MAX setting test, the filters ranked as follows from Darkest to Lightest:
BowerSingh-Ray (5+ Stops Brighter than #1)Hoya (~ 1 stop brighter than #2)Tiffen (~ 1 stop brighter than #3)B+W (~ 3 stops brighter than #4)
Please note that due to lack of light, some of the MAX shots are black.
For the impact on sharpness analysis (done on a NEC PA 322UHD 4k Display at 300% in LR 5.7 compare mode), my findings are as follows (from least impact, to worst impact):
Singh-Ray - none – same result as no lens filter at allB+W - minimalTiffen - very badBower - horrifically bad
CLICK HERE to see the bookcase MIN and MAX shots, and be sure to READ THE CAPTIONS to see which one is which. To learn more about any photo, hover over the photo and click on the information icon on the top right of the photo.
These were the photos that were use for the sharpness evaluation. In the case of Tiffen and Bower I was so concerned by the results that I repeated them – twice – including doing a manual re-focus with them. The results remained the same – they were significantly optically softer to the others in the test. I see no obvious malfunction of either product, so I can only conclude that these soften the image more than the others.
What follows are the results from the controlled test taken during a 22 minute test window in identical conditions.With no filter, 0.6 sec was required to get a 0 EV exposure so that was the pre-filter baseline. All of the filters at MIN were able to do 2 seconds at 0 EV, so review them in the gallery to see how they compare. I then chose 25 seconds for the MAX setting (except on the Bower where I tried 30 sec to avoid a black exposure – unsuccessfully – even at ISO 25,600 @ 30 sec it was still pretty dark).For the 25 second MAX setting test, the filters ranked as follows from Darkest to Lightest:BowerSingh-Ray (5+ Stops Brighter than #1)Hoya (~ 1 stop brighter than #2)Tiffen (~ 1 stop brighter than #3)B+W (~ 3 stops brighter than #4)Please note that due to lack of light, some of the MAX shots are black.For the impact on sharpness analysis (done on a NEC PA 322UHD 4k Display at 300% in LR 5.7 compare mode), my findings are as follows (from least impact, to worst impact):Singh-Ray - none – same result as no lens filter at allB+W - minimalTiffen - very badBower - horrifically badCLICK HERE to see the bookcase MIN and MAX shots, and be sure to READ THE CAPTIONS to see which one is which. To learn more about any photo, hover over the photo and click on the information icon on the top right of the photo.These were the photos that were use for the sharpness evaluation. In the case of Tiffen and Bower I was so concerned by the results that I repeated them – twice – including doing a manual re-focus with them. The results remained the same – they were significantly optically softer to the others in the test. I see no obvious malfunction of either product, so I can only conclude that these soften the image more than the others.
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