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Jun 21, 2018 at 20:28 comment added scottbb These center filters are designed to compensate for the light falloff towards the edges of the field of view. They cannot compensate for vignetting caused by objects in front of the lens, such as the OP's filter holder. The objects cause more-or-less hard vignetting, as opposed to the gradual vignetting of light falloff off-axis from the len's optical axis.
Jun 19, 2018 at 20:19 review Low quality posts
Jun 19, 2018 at 22:40
Jun 19, 2018 at 9:27 review First posts
Jun 19, 2018 at 20:15
Jun 19, 2018 at 9:22 history answered stk CC BY-SA 4.0