I have a pair of Nikon 9 x 30 HCF roof prism binoculars and have noticed that the eyepiece glasses appear to have developed a cracked glaze or spiders web type appearance on the internal surface. I appreciate these binoculars are quite old but would ask if this problem is repairable. This problem does not appear to effect the performance of the binoculars. Thanks in advance of your reply.

SOURCE: Need eyepieces for Nikon Monarch ATB 8x42 Binoculars

If its the caps that cover them Nikon in your country can order them. They take about six to eight weeks if they are not in stock. If its the actual eyepiece lens an all you would need to have purposfully removed them and in doing so destroyed the waterproofing. If its the caps contact Nikon. You can also download the instructions from their website.

SOURCE: I hace a pair of swift ultra light binoculars and

i would take one out of the other side and take it to a hardware store and see if i could match it up with some thing.

SOURCE: Broken eyepiece, 1940s vintage 7x50 individual

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.