For context, I don’t even own a telescope yet. I took somebody’s advice and bought a binocular 20 x 80 and a parallelogram mount and started to learn the sky that way. I realized how much I enjoy the binocular view. Mine has a reported true field of view of 3.5 and apparent 70 degrees (but I suspect they are actually a bit less). I do understand TFoV and AFoV but perhaps one should also mint “Subjective Apparent Field of View”. When I close one eye, I have the same AFoV as with two eyes, but somehow it seems less. My brain likes the twin view.
Now I caught myself wishing there was a way of buying a couple of new eyepieces for my binoculars. And I realize that I would be happy to pay for two, to get the binocular view, as opposed to saving money and get a monocular view. And then I learned that there is something called binoviewers for telescopes.
Maybe, when I do buy a telescope, I should buy a binoviewer and double sets of eyepieces? Those of you who have tried, did you like the binoview? Why? Why not? If you like it, do you use if for everything or only for, say, clusters? Are there any downsides, except for, obviously, cost? Would zoom lenses work in a binoviewer, or would it be hard to get the exact same zoom in both eyepieces?
How would you compare the subjective apparent field of view of a single 100 degree EP to a 68 degree binoview? Am I likely to get disappointed by a binoviewer because there is actually no parallax and thus only an illusion of depth?
I’m a bit surprised that I have never heard of these before. My gut feeling would be that a binoviewer should be a superior way to observe. Coming to think of it, why do some birders use single tube telescopes? They should definitively benefit from binocular views. Is it only cost and portability?
I'm aware of technical issues like field stops and focusing, but for now I'm mainly asking about your subjective feelings and personal reasons for liking or disliking binoviewers.
EDIT: I can't edit the headline. I meant Binoviewers anyone?
Edited by Porkkala, 04 June 2020 - 05:08 AM.