16th May 2002, 02:59 AM
17th May 2002, 11:25 AM
Re: How to check coatings on a lens??
Originally posted by Bean
Would like to know the following
[list=1][*]What does the coating on the elements of the lens do to the image?
> better light transmission, and less internal reflection.
[*]How will the image suffer if some of the coating of the elements are gone or eaten up?
> uneven light transmission, might not be able to notice though.
[*]How do you check a 2nd-hand lens that the coatings are still there?
> Look at the surface...about 130 degree to your eyes...and you should see good even colour on the glass surface.
[*]How much coating on each elements are there on a typical lens?[/list=1]
> different company apply differently.