Dante
3-Apr-2018, 10:42
Hi -
I am looking at a 75/4.5 Nikkor in a Copal 0, and it has a small hazy mark (1-2mm dia) dead center on the front element.
The plastic Nikon front lens cap has a small pip in the center of its back ("inside"). I have surmised that the mark was caused either by (1) screwing down a filter (presumably with the wrong type of mount) on the front element or (2) the plastic pip contacting the glass. The spot has not responded to a lens pen nor ethanol or methanol, which makes me doubt it is plastic rubbed into the front coating. Maybe at best the coating of the filter rubbed off onto the lens element.
Are these marks common on this lens? I have not encountered this save on one SLR lens that had the "wrong" filter mounted (actually, it was a filter with loose glass). That mark actually came off (how, I'm not sure; a repairperson did it - and it did not kill the front coating on the lens - which makes me think it was rubbed off coating from a filter).
Thanks!
I am looking at a 75/4.5 Nikkor in a Copal 0, and it has a small hazy mark (1-2mm dia) dead center on the front element.
The plastic Nikon front lens cap has a small pip in the center of its back ("inside"). I have surmised that the mark was caused either by (1) screwing down a filter (presumably with the wrong type of mount) on the front element or (2) the plastic pip contacting the glass. The spot has not responded to a lens pen nor ethanol or methanol, which makes me doubt it is plastic rubbed into the front coating. Maybe at best the coating of the filter rubbed off onto the lens element.
Are these marks common on this lens? I have not encountered this save on one SLR lens that had the "wrong" filter mounted (actually, it was a filter with loose glass). That mark actually came off (how, I'm not sure; a repairperson did it - and it did not kill the front coating on the lens - which makes me think it was rubbed off coating from a filter).
Thanks!