Thanks Graham. I'm afraid I don't know the answer to your question because I haven't recently seen, much less tested, any other wide-angle binoculars of the same vintage. I did test a Nikon Action I wide-field 7x35 from about 1985 a couple of years ago. The Nikon is a very nice binocular, but I...
That's an easy enough supposition to test. I'll substitute a smaller eyepiece field stop and convert the Rangemaster's field to an "ordinary" width. I doubt that it will matter since the very same rays will go into forming the image in the central part of the field as now.
Thanks to John Dracon, I’ve had the opportunity to play around with a monocular version of the Fuji made Rangemaster for the past couple of weeks. Reading back over this thread I see that much has already been well covered, so I’ll try not to repeat what’s already been said, except to confirm a...
Thanks for the offer. I'll send you an email.
Graham or John,
Do you know what optical design the booster uses? The only thing I can imagine working ahead of the objective is some sort of 2.5x Galilean telescope.
The eyepiece you describe is a bit of a mystery to me. Is it the very same 70º one used in the CF Rangemaster? Where is the cemented doublet placed in the order of elements?
Also, how are your Fuji binoculars labeled as to coatings, "Coated Optics" or "Fully Coated".
It would be easier to interpret the reflections if the background were black rather than white, so we could only see the reflections from the glass surfaces, not the light that returns from the white surface. What you're looking for are bright white reflections nestled among the...
I'm still curious about the extent of AR coating in the Fuji Rangemaster. Your photos of the front end appear to show coating on both the front and rear glass to air surfaces of the objective elements. If you remove an eyepiece your should be able to see if some of the internal eyepiece...
At the time these Rangemasters were made the Japanese optical industry standards allowed the use of the term "fully coated" only on binoculars in which all optical surfaces were coated with the single layer coatings that were available then. "Coated optics" could be used on binoculars...
I notice the label "coated optics" on a photo of the Fuji made Rangemaster. In the binocular marketing speak of that time "coated optics" usually meant that some surfaces were uncoated, sometimes most of them. Anybody know how many surfaces are actually coated.