Question about Optics
I have 1970s vintage KMart Focal 7x50 binoculars with siam optics. The rubber eyecups have split and I need replacements. The cups fit over the housing which is 3.5cm or 1 3/8in.
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Posted on Jan 02, 2017
Here in Melbourne, Australia I make these for people who need them. I also have a reasonable amount of stock generic ones. The question is not so much the size of the ring, but the thread size, the depth of the eyecup (depends upon the magnification) which sets your eye at the correct distance behind the eyepiece (eye relief) and the size of the central hole to suit the size of the eye lens. There would be other small engineering companies that could make one for you out of delrin.
Posted on Mar 03, 2010
You'll need to measure your eyepiece in "mm". Also determine if your eyepiece has an outer ring the eyepiece will slip over. You can find eyecups/guards on Ebay. Search under Binocular Eyecup or Binocular Eye Guard. There are also eyecups under "rubber eyecups/rubber eyeguards" but alot of these are for Microscopes and may not fit. You will need to pay close attention to the mounting type and measurements.
Posted on Mar 20, 2010
i have the same bino's. did you find replacements?
Posted on Sep 02, 2012
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