I need technical advise. I have a UV filter which i always clean after a day of shooting. Normally, when i wipe, the filter glass will not rotate.
However, recently, the glass starts to rotate during wiping motion. It is loose. How can i tighted the clamping ring? I see a thin ring at the edge with a flat line groove. Is this the ring to tighten? How to do it without damping the filter glass?
Or is the filter spoilted?