Question About Binoculars For Astronomy?
Monday, October 5th, 2009 at
11:10 am
I would like a pair of binoculars, mainly for astronomy. I have read that astronomical binoculars should be no more than 8x56. The link to the ones I am interested in is below. They are 25x100, but are advertised as astronomical binoculars. I understand the higher the magnification, the harder it is to hold them steady. I do have a camera tri pod I can mount them on, but I don't always want to use the tri pod. Are the ones I am looking at good, or is there something better someone can suggest? Thanks.http://www.telescope.com/control/product…
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 Galileo Astronomical Binoculars Water Resistant 20x  US $95.61
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 Super Astronomical Zoom Binocular Telescope 15 180X100 US $95.88
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 Super Astronomical Zoom Binocular Telescope 15 180X100 US $57.92
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 ZHUMELL20x80mm32 GIANT ASTRONOMICAL BINOCULARS US $149.00
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 NOVA 20x80 Triplet Obj Astronomical Binoculars BNew US $155.00
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 DIA STONE 11x80 COATED OPTICS ASTRONOMICAL BINOCULARS US $99.00
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25x binos will need a bino mount. There isn’t any substitute for that. I find even with 7 or 8x binos something to rest them against is essential for the best views – I prefer a wooden stake driven into the ground until it is around chin height. Image stabilised binos are another option but I have never seen them higher than 20x, and even then they have much less aperture than typical for astro binos of equivalent power.
In the case of these 100mm binos the magnification is not the only factor – there is also the sheer weight. Those binos weigh over 10lbs – much too heavy to comfortably use hand held.
Big binoculars like that are great for many types of viewing, but you will need to use them on a tripod or other support at all times. Their combination of size, weight, and magnification makes hand-held viewing virtually impossible. That’s no doubt why the source you read recommended 8×56 max. A reclining chair and a parallelogram mount ( http://www.telescope.com/control/product… ) is a good combination for comfortable viewing, or better yet, build a binocular chair: http://www.iceinspace.com.au/63-382-0-0-… The reason people go to these lengths is because using these binoculars on a straight tripod mount gets uncomfortable pretty quickly. That’s why so many amateurs opt for something hand-holdable.
the view through big binoculars can be spectacular – i have a pair of 20×80s myself – but they are heavy and difficult to hold steadily.
for day-to-day observing the usual choice is 7×50 or 10×50. image stabilized is fun if you can afford it. binoculars are a powerful observing tool, and all astronomers have a pair.
my favorite size for backyard meteor gazing is 7×50.
when picking a pair, try to go for a big field of view.
The best for views of the moon and the milky way are 7X50.
Aperture and field of view angle are important. But so is holding them. There are pantograph supports that maintain angle while adjustable in height. Or you could get the Sky Window. It will let you sit at a table and observe.http://www.tricomachine.com/skywindow/
Or you could get a motorized observing chair from Hammacher Schlemmer for about $2K
Or you can modify a lawn chair or build your own.http://ghonis2.ho8.com/garysbinochair4.h…http://www.tulsawalk.com/projects/rac100…http://www.gillcouto.com/cloudynights/bi…
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I am not one, but I think you need to have some sort of background in mathematics, as well as physics.
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