I've bought a second hand Nikkor 300mm F4 ED lens, the lens is in excellent condition, apart from the front lens element.
On the inside of this element, there are some circular discoloured spots. Around the edges of the element there is a discolaration and a small area of the element has what looks like fogging. All of this is only observible in direct light.
I know this is not fungus. A local service centre says it is something to do with the lens coating and will not effect picture quality.
Do I have something to worry about? Will it effect picture quality? Or do I need to have the lens recoated.
#1. "RE: Lens coating of Nikkor" | In response to Reply # 0f5fstop Basic MemberWed 20-Sep-00 06:10 PM
Only way to tell if it will affect a photo is take some photos and see if they are affected.
In my experience, anything that is evident on an optical element will affect the photo. However, I have never had a coating peel off, so I cannot say if this will affect the photo.
What you described sure does sound like fungus.
"Take only photographs, leave only footprints"
#2. "RE: Lens coating of Nikkor" | In response to Reply # 1frankie Basic MemberWed 20-Sep-00 07:13 PM
It's possible that the fungus is long since dead, but before it left the presence of the lens, it managed to etch away at the coating and possibly at the glass.
When lens-coatings "go" you usually end up with a thick "environmental" coating. That's why one of my older coated lenses tends to "glow" like a rainbow when you use it in the sng, and it doesn't affect the picture quality.
The other possibility is that someone over-polished the glass, removing the coating (or marring it) ...
#3. "RE: Lens coating of Nikkor" | In response to Reply # 0
Thanks for your replies. I've send the lens to our local Nikon service centre to have the relevant lenses replaced. This is a costly solution, but including the repairs I still pay a lot less than I would have for a new lens.
I believe that for a lens defect to be visible, it must reflect light. And if it can reflect light out of a lens, then it must effect photo quality. Maybe not on normal size prints, but on bigger enlargements it will be visible.