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<blockquote data-quote="BackdoorArts" data-source="post: 116741" data-attributes="member: 9240">One more thing to add.&nbsp; Others have mentioned the placement of the front element in the lens and its proximity to the leading edge of the lens tube as a factor in the need for add'l protection.&nbsp; I will also point out that the closer the element is to the front of the lens the more likely you'll get low light reflection (ghosting) between the front of the lens and the back of the filter.&nbsp; I shoot at night a lot and had never noticed an issue with the filter on my 24-85mm.&nbsp; But a week ago I was shooting a tree silhouetted by a partial sunrise with a small crescent moon under one branch.&nbsp; When I checked the image for focus and zoomed on the moon I was floored to see a slight ghost below it (wish I'd saved it as an example).&nbsp; Took the filter off and it was gone.&nbsp; Stuck my 85mm 1.8 on with filter (deeper set front element) and did not have the issue (the camera stayed on the tripod).Like I said, get to know your equipment - but remember, you never stop doing so.</blockquote>

[QUOTE="BackdoorArts, post: 116741, member: 9240"] One more thing to add. Others have mentioned the placement of the front element in the lens and its proximity to the leading edge of the lens tube as a factor in the need for add'l protection. I will also point out that the closer the element is to the front of the lens the more likely you'll get low light reflection (ghosting) between the front of the lens and the back of the filter. I shoot at night a lot and had never noticed an issue with the filter on my 24-85mm. But a week ago I was shooting a tree silhouetted by a partial sunrise with a small crescent moon under one branch. When I checked the image for focus and zoomed on the moon I was floored to see a slight ghost below it (wish I'd saved it as an example). Took the filter off and it was gone. Stuck my 85mm 1.8 on with filter (deeper set front element) and did not have the issue (the camera stayed on the tripod). Like I said, get to know your equipment - but remember, you never stop doing so. [/QUOTE]

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