Reflector Telescope Tripod

QUESTAR 3 .5 REFLECTOR TELESCOPE W TRACKING BASE VGC

Think about it, binoculars are inexpensive, highly portable and require no complicated setting up procedure.

Binoculars allow excellent moon views, and great viewing of star fields, comets and even deep sky objects. They are especially useful for beginners as the right way up view makes it easy to navigate the skies. With a little practice you can pick out several of the planets and even the larger moons orbiting Jupiter. Clusters like Pleiades look great because the binoculars wide field of view lets you have more of the cluster in view at once.

So how to choose which ones? Binoculars have two specifications marked on the body of the binocular in the form of 7x 50, where the first number represents the magnification (in this case 7 times) and the second the aperture (50mm in this case). When it comes to selecting the right binoculars for astronomy, aperture is the most important feature to think about. The bigger the aperture the more light is captured so the brighter and clearer the image will be. For astronomy use you will need at least 40mm aperture and preferably larger.

You will need a magnification factor of at least 7, maybe up to 10 if you have a steady hand. Any higher than about 10 times magnification and you will need to mount them on a tripod as the hand shake effect makes it difficult to get a sharp image.

There are giant binoculars available with higher magnifications and apertures which are designed for astronomy use but you will certainly need a sturdy tripod or mount to use them. These can offer excellent viewing up to about 25 times magnification with 100mm apertures.

This brings us to another point, a specification known as the 'exit pupil'. This specification refers to the diameter of the shaft of light that reaches your eye. You can easily calculate it by dividing the aperture by the magnification so that 7 x 50 binocular has an exit pupil of just over 7mm. Capturing as much of that as possible is good as it means all the available light is getting to where you want it, i.e.your eye. If you are still in your twenties you can probably use all of that 7mm exit pupil above as your pupils will dilate to about that size in very dark conditions, however as you get older your pupil does not dilate more than about 4 to 5 mm so large exit pupils are wasted.

You might notice another specification marked on the binocular, the field of vision (FOV), it refers to the apparent 'width' of your vision as you look through the binoculars. It will be expressed as an angle in degrees or a measure such as 340 feet at 1000 yards. For astronomy use we can generally ignore that factor, it really does not matter a great deal at the distances we'll be viewing at.

See more on binoculars for astronomy and other purposes at BinocularChoice.com In particular take a look at: Binoculars for Astronomy

Telescope buying question?

Okay, ive been looking around for a telescope for my girlfriend for christmas..and i want to know in general what would make a better telescope..is 50 mm mirror length okay? or would i need one with 76mm mirror length as in this one here: http://cgi.ebay.com/New-White-3-Reflector-Telescope-4-Space-w-Tripod_W0QQitemZ140281922630QQihZ004QQcategoryZ28181QQcmdZViewItemQQ_trksidZp1713.m153.l1262 my other question about it though, is are there any other important factors to be looking at that would make that a bad/good telescope? also do u think this is to kiddish for a 24yo girl? please help me out..gotta buy somethin today =)

Considering the low costs of telescopes these days, a 50mm or 75mm reflector is extremely small and relatively worthless as far as telescopes go. And considering the price of the one you mentioned, I would be very suspicious of its quality and optics.

Try going to OrionTelescopes.com and take a look there. I would trust them more than someone selling on eBay. They have a similar telescope called the SpaceProbe 3 EQ. It's $99. Or a Orion Observer 60mm Refractor for the same price.

I have dealt with Orion before and trust their quality. And the refractor telescope might be a little easier to use for the beginner.




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