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Yes, residues will remain, they can be washed with Windex and/or vinegar (in most cases... if glass is not damaged)
Of course, you have to dismantle it to get to the internal affected parts.
I found those lenses behave much better in terms of coma and CA with external aperture... however this one seems to be quite OK (could you show us crop from one of the corners at full resolution?)
Last edited by bojan; 06-07-2017 at 08:24 AM.
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