Sorry for the long delay, but I now have those photos I took of the real binoculars from the Grand Canyon(in the first image of this forum in the postcard). I unfortunately space out when I went there in Oct 2019 for the Mercury Transit, but went back to Grand Canyon in January. Been very busy, but will copy and paste them here sometime, Hopefully in next 24hours.. From the pictures I took of them, with my hand in one image for reference in size, I believe them to be about 100mm/ 4inches of glass each(My opinion-but could be wrong).. They do not allow to touch them or I would of move it upwards to look directly at the objectives, and take a picture, but they were standing upwards on the main glass, so it was not possible.
Pictures coming soon, for comparisons. Thanks for being patient.
sincerely Dennis for the record here is my main binoculars I use just about every night here in Arizona. 150mm(6inches) custom made, IStar optics, F-5. ... Very impressive views. Sorry but I like wide views, so I am using the Morpheus Lens, 17.5mm / 9mm and 6.5mm for viewing. Stunning views of scanning the Milky Way clusters, stock, NGC, planetary nebulas and more. Give a whole different perspective when viewing with *(two) eyes!
As a side note.. I do go a bit crazy, and as noted by my signature of CN,(below), I have a 12inch folded refractor F-17 and I also use, a rare, (2inch)binoviewer(Siebert design), with 22mm Naglers for a Wow view. Saturn at the Grand Canyon Star Party was the highlight!