Do Telescope Binoculars Really Work That Well?
Thursday, January 14th, 2010 at
8:07 pm
I think that's what they are called. I can see that body and earth movement would be a problem, but as long as I could look at Mercury, Venus, Mars and Jupiter for a minute or so at a time, I would be happy. Can you see Saturn at all? If you like these types of binoculars, what do you suggest as best?
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Tagged with: Binoculars • Really • Telescope • Well • Work
“Telescope binoculars”? No such term. There are “astronomical binoculars”, binocular telescopes, and binoviewers which use a prism to split the single light cone from a regular telescope to converge into two eyepieces.
Astronomical binoculars start as small as 10×50 on up. As Eri said, you can see these targets with the naked eye. I have a pair of 25×100 binoculars (a bit of a hassle to mount adequately). With them I can just begin to make out the rings of Saturn and the two most prominent belts of Jupiter. Lower magnification won’t show these, though you can still see the Galilean moons of Jupiter and sometimes the phases of Venus with 7x or 10x.
Binocular telescopes, which are two twin telescopes with interchangeable eyepieces are generally of small aperture (less than 110mm unless you have one custom made), only moderate magnifications (usually less than 50x), are relatively expensive in themselves and are massive enough that they will demand a massive expensive mount to use them (forget about hand-holding!).
The above a choices that most appeal to the “richest field” viewing of star clusters, nebulae and other non solar system objects except for hunting down comets, which have a nebulous appearance.
If your main interest is planets you are best off with a regular telescope. Some people like binoviewers with their telescopes. But they are not an essential accessory, and if (like me) you have problems merging images with your eyes then they won’t appeal at all.
There are many types, and they’re not all equal. You can see Saturn with your naked eye, so you’d see it a bit better with binoculars or a telescope, but the size of the primary mirror will determine how well. If the mirror is fairly small, the rotation of the Earth won’t be a big problem for looking at planets because they won’t move out of your field of view very fast.
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Speak for yourself.