How can I tell if a scratch is directly on my sensor or on the filter above it?

by Tejash Appu   Last Updated June 25, 2018 18:18 PM

I have what appears to be a scratch on my sensor. I can't see this scratch on my pics in aperture range less than 16 but on range f32 I can notice them . How can I know wat type oftell if a scratch is directly on my sensor or on the filter above it



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