Quote Originally Posted by Dan Fromm View Post
Easy for you to type and me to read. But I don't have the lens to look at. Do you?

Counting reflections will answer the question if the cement is still good.
Agreed. For the owner, mine is just the easy first test. If there's no obvious separation proving it's cemented, proceed to your second test. I'd recommend the owner unscrew one cell and check that for reflections, so the test is of a simpler configuration. (Personally, I'd remove the glass elements from the mount and see if it's one cemented group or two separate elements, but some people may not be comfortable with that.)