HELP! What is this on my lens?

Started Nov 22, 2012 | Discussions thread
OP Ichinichi Regular Member • Posts: 133
Re: Lenspen for removing oil stain

ProfHankD wrote:

Ichinichi wrote:

Just tried with alcohol qtip and no change.

Hmm. Not likely it's oil residue then.

It's possible it could be a patch of missing coating, or separation between elements, or...?

Not likely the lenspen will make it disappear either....

I don't think it is separation between elements because the "filmy residue" is not on a surface that touches any other element.

Maybe how it looks when all assembled might help? Here's what the residue looks like when the lens is assembled and light hits it just right:

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