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Camera sensors can have either permanent or intermittent faults in individual pixels. The pixel can die (not record data), or get stuck (always record a particular colour) Or the pixel might work fine for light use, but fail for long duration images or continuouse shooting - a hot pixel. This article contains some simple tests that can be used to identify ...


TL;DR: is the scratch visible? Perhaps, perhaps not. I ended up buying the ND filter because I bought a lens from the same online used camera store and had to pay the shipping fee anyway due to the lens, so this filter was a very cheap purchase. The scratch is very hard to be photographed. It is visible to the naked eye if you rotate the filter in exactly ...

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