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Lens edge blackening - it is not a myth
Hi Michael,
To blacken the lens edge, I use black permanent marker, and fine Black Sharpie for the small groove between cemented doublet lens.
Just make sure I don’t clean them later with acetone or other solvent cleaners, or else I will create a mess.
I can vouch that lens edge blackening is not a myth.
I have a pair of 10x50 Tasco Zip binoculars which suffered a loss of contrast when I got it second hand. I blacken the cemented doublet objective lens first, it did improve contrast a little.
I then blacken the two eyepieces as well (each eyepiece comprised of a doublet lens and a plano convex lens) and the improvement in contrast is definitely noticeable with the naked eye.
Nothing else was done to the binocs other than blacken the lens edge for the objectives and eyepieces. It is not perfect but I am much happier now with it than when I first got it.
Kind regards,
Bill
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