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Message: <blockquote data-quote="typo" data-source="post: 3535238" data-attributes="member: 83808">CJ,I suspect knowing that information will often provide little, or possibly no help at all in predicting whether spectacle frame would be compatible with an eyecup design.You can see from the attached photo that, not only that I perhaps lack a little imagination when it choice of frames, but how even tiny differences in design can make a difference to binocular usability.Of those three designs, only one of them causes me a problem when using binoculars, and then with only one model out of those six I've mentioned. The model in question has exactly the same distance between the high points on the eyecup rim as the Prime, but the problematic one has a more acute external radius. It means that the ends of the metal bridge pivot between the eyecup surfaces meaning it's difficult to get the lenses flat against the eyecups. Drives me mad. The dilemma is, I could order that same frame again and it would be fine if the technician set the reading point on the lens a couple of milimeters higher or lower. It wouldn't be a problem if my IPD was 2mm wider or narrower. In fact I could probably get the frame fitting guy to alter the position of the pads a little and it would work fine. It's the near design that is the problem with the model I own, but I know from going round the stands at BirdFair that the middle one has a couple of incompatibilities too. The far one caused few problems, but it's rare enough with the others not to be an condideration. The nearer two spectacles actually have identical lenses, but it was the nearest that was intended as my birding specs. The frames were half the price of the others, as I expect you can tell. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />Neither true ER nor available ER would be any help in this case.David</blockquote>

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