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Will Filter With Scratches Affect Image Quality?

al2


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al2 Registered since 29th Jan 2007
Sat 10-Feb-07 11:08 AM

Hi,

Based from the title above, of course the quick answers are either "depends" or yes it will (depending on the severity of the scratch).

But how much scratches/marks are we talking about here before it will actually affect the image quality?

And the decrease of image quality, is it in terms of contrast, sharpness, or something else?

I recently got a used lens and it comes with 72mm Nikon L37c filter.
It has quite a lot of scuffs, not big, thick ones, but minor ones like the one you'll get if you wipe your lens with a "hard" cloth (not using proper lens tissue). Apart from those, it also has this little mark around 1mm.

Do you think those marks will actually affect image quality? I know for lenses, it will take lots of marks and dust before you can actually tell the difference. Does the same thing apply for filter as well?

I honestly can't really tell the difference, but just wanna make sure that it's not me that is not inspecting carefully enough. Thanks!

PS: On a side note, do you think a Nikon 85mm 1.4 AIS need this filter? (for use with digital)

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