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Brian Ellis
9-Jan-2011, 22:03
Could someone tell me whether the white ring at which the red arrow is pointing is separation and if not, what it is if anything abnormal?

domaz
9-Jan-2011, 23:20
Is that a modern zoom lens?

GPS
10-Jan-2011, 00:54
Overflown balsam.

Steven Tribe
10-Jan-2011, 04:34
It is just too symmetrical to be separation. Modern glues (if that is the case here) produce Newton's rings before edge symptoms.

Brian Ellis
10-Jan-2011, 15:28
Is that a modern zoom lens?

No, it's a 15mm Zeiss Contax Distagon.

Brian Ellis
10-Jan-2011, 15:30
Thanks for the replies. I know what balsam is but how would it overflow - because someone has tried to repair it in the past?

GPS
10-Jan-2011, 16:37
Thanks for the replies. I know what balsam is but how would it overflow - because someone has tried to repair it in the past?

It can happen during the assembly of the lens. Simply small surplus of the glue.