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Why are some big telephoto lenses so expensive compared to ...

photo.stackexchange.com/questions/62196/why-are-some-big-telephoto-lenses-so-expensive-compared-to-telescopes

Apr 27, 2015 ... What makes this so expensive? I know that a good ... But why are camera lens so much more expensive than refractor telescopes? telephoto ...

How to Choose A Telescope for Astronomy - Sky & Telescope

www.skyandtelescope.com/astronomy-equipment/how-to-choose-a-telescope/

Apr 16, 2014 ... Aperture: A Telescope's Most Important Specification .... For this reason, refractors are the most expensive instruments of any given aperture.

The 5 Most Powerful Telescopes, and 5 That Will Define the Future ...

www.popularmechanics.com/space/telescopes/a12257/4299775/

Jan 22, 2009 ... Here are the five most powerful telescopes out today, and five more that .... proposal turned out to be a bit too complex and expensive to build.

Telescopes 101

www.wwu.edu/skywise/a101_telescopes.html

Before you buy a telescope, you should first consider binoculars. They are ... This problem is greatly mitigated in more expensive models by the addition of more ...

World's most expensive telescope takes first pictures of ... - Daily Mail

www.dailymail.co.uk/sciencetech/article-2044840/Worlds-complex-telescope-takes-pictures-deepest-space-quest-knowledge-outer-universe.html

Oct 4, 2011 ... The radio telescope is the most expensive ground-based telescope ever built - and the highest-altitude, at 16,000ft. Chile's Atacama desert was ...

Why are Dobsonian Telescopes a Favorite Among Amateur ...

www.universetoday.com/84285/why-are-dobsonian-telescopes-a-favorite-among-amateur-astronomers/

Nov 13, 2011 ... So what is a Dobsonian telescope and why are they so good? ... They can be many times larger and less expensive to produce than scopes ...

Orion 50" Monster Dobsonian Telescope | Orion Telescopes

www.telescope.com/Orion-50-Monster-Dobsonian-Telescope/p/9162.uts

The telescope is designed to be light for its size and very stiff — so that collimation is maintained as you sweep across the sky. The top cage is aluminum with ...

Why build the Hubble Space Telescope? | Galaxy Zoo

blog.galaxyzoo.org/2010/08/30/why-build-a-space-telescope/

Aug 30, 2010 ... ... wrong and telescope maintenance is either impossible or at least very expensive. Why not simply build a ground-based telescope which is a ...

The most expensive things in the world money can buy - MSN.com

www.msn.com/en-us/money/personalfinance/the-most-expensive-things-in-the-world-money-can-buy/ss-BBjMGB7

May 13, 2015 ... Most expensive telescope. The Hubble Space Telescope (HST), launched by NASA in 1990, is the most expensive telescope, costing $2.1 ...

Starizona's Telescope Basics

starizona.com/acb/basics/equip_telescopes_scts.aspx

Schmidt-Cassegrains telescopes (SCTs) have become one of the most popular ... of telescope must have aspherical mirrors, which are difficult and expensive to ...

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NASA Completes World's Most Expensive Telescope After 2 Decades

www.natureworldnews.com

Nov 8, 2016 ... NASA researchers have now come up with the largest and most expensive telescope the world has ever seen: the James Webb Space ...

Best Telescopes for the Money - 2016 Reviews and Guide

www.space.com

Nov 22, 2016 ... Here are the best telescopes for the money. ... And there's a slightly more expensive AstroFi 5-inch (130 mm) Newtonian reflector, as well.

Q & A: What is the best kind of telescope? | Department of Physics ...

van.physics.illinois.edu

The best kind of telescope really depends on what you want to use it for. ... and mirrors, but these are usually extremely expensive and are more difficult to use.