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i mounted this on a Sony 135 1.8 lens with a Sony A99 full frame. Tested setup on a tripod at an eye chart. Locked the gear and fired at several with or without filter combinations. Under studio lighting, I actually got better contrast with the same pixel level resolution when the Heliopan digital filter was on. I tried using my old favorite the B+W nano clear line filters and the contrast was not as good there. The resolution at pixel level was also off versus the Heliopan and versus the naked lens. So to sum it, the Heliopan gave better contrast than the lens under indoor lighting keeping the same sharpness. The B+W was a tad less sharp versus the lens.
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