Re: Multicoated filter on a single-coated lens

[Chris Brogden]

On Wed, 18 Apr 2001, Paul Jones wrote:

> I have a F50/1.7 and it has developed little marks in the coating and i
> have no idea what that are from. they dont affect image quality at all.
> Would be curious to know what caused them.

Could it be the cement between two elements in a group separating in
places?  This can show up as small circular marks, I believe.

chris

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