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<blockquote data-quote="Lee" data-source="post: 138642" data-attributes="member: 8142">It's very likely; at least most probably glass - either the lens or the filter. I have stopped using filters, aside from those for specifically designed purposes, such as a polarizer or ND filter.&nbsp; The quality of the filter also makes a big difference.&nbsp; Last year I purchased a ND Filter and thought I'd save a few bucks going with a well known, not a cheap, brand, but 'middle of the road' brand.&nbsp; They produce filters to fit various budgets and I stuck with the middle.&nbsp; Short story, I lost most of the photos I took with it on.&nbsp; If you are going to use a filter, I would recommend buying the best you can afford, even if it means having none for a few months and saving for it. Have you removed the filter and given both sides of the lens and filter a good clean? Just a slight cloudy residue from wiping glass will be magnified as soon as any light hits it at the right (or wrong) angle. Let us know how your next test run goes <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="Lee, post: 138642, member: 8142"] It's very likely; at least most probably glass - either the lens or the filter. I have stopped using filters, aside from those for specifically designed purposes, such as a polarizer or ND filter. The quality of the filter also makes a big difference. Last year I purchased a ND Filter and thought I'd save a few bucks going with a well known, not a cheap, brand, but 'middle of the road' brand. They produce filters to fit various budgets and I stuck with the middle. Short story, I lost most of the photos I took with it on. If you are going to use a filter, I would recommend buying the best you can afford, even if it means having none for a few months and saving for it. Have you removed the filter and given both sides of the lens and filter a good clean? Just a slight cloudy residue from wiping glass will be magnified as soon as any light hits it at the right (or wrong) angle. Let us know how your next test run goes :) [/QUOTE]

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