I found a 4"x4" Wratten 80A fliter for my B&W fog shots, but its scratched---yet for $5 its tempting. Do you think a scratch would cause signifcant degradation? Many of my lenses have those "cleaning whisps" eBay sellers are so fond of but I've yet to be dissppointed by the performance, I would think a scratch on filter would be less of an issue. Your thoughts?
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