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Message: <blockquote data-quote="Felisek" data-source="post: 334812" data-attributes="member: 23887">Unlikely. The filter would have to either lose its transparency or be distorted to affect sharpness. I don't think even the cheapest filters suffer from such problems. The biggest issue with cheap filters is the coating. Poor coating leads to reflections at filter surfaces, which in turn can create flares and reduce contrast.A dirty filter can affect sharpness. I recall photographers smudging glycerin on a clear glass to create a simple soft filters for portrait photography <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>