How Do Telescopes Work – Telescope Lenses
Lenses and mirrors are the elements used to collect and view focused light in telescopes. Mirrors are the medium for focusing in reflector telescopes, while lenses are the medium in refractors. Each type has its own distinct advantages and disadvantages. Refractor type telescopes use lenses. These lenses bend the light when it enters the telescope from the distant object being viewed through it. Because of this refraction it is possible to closely view a distant object. The telescope has two lenses, with one slightly larger.
The eyepiece in the telescope is generally a small lens. Some telescope however, may not use lenses for the eyepiece at all. The eyepiece, in any case, is the most important element of a telescope. It is the element which lets you see correctly whatever it is that you want to focus on. These eyepieces are adjustable and are of a low power. Adjusting the eyepiece allows you to change the magnification factor. What kind of lens you use for the eyepiece is a personal choice. In today’s age, several different kinds of eyepieces are available in the market. Because of this motley available, choosing the correct eyepiece fro your requirement may be a difficult task. As a result, you should concentrate on defining the criteria you think are important for your choice. The depth of field, optical quality, sharpness, clarity, brightness, market price, barrel size and how it affects your eyesight are some of the major points of concern. However these criteria always remain individual prerogatives.
Lens designs used in older telescopes go by the name of Huygens and Ramsden. Professional astronomers are advised to not use these lenses anymore as they are not of superior quality, even though they are comparatively less expensive than other market lenses. These lenses also do not provide correction for chromatic aberration or the light circles that form around brighter objects when they are viewed.
Professional astronomers use orthoscopic lenses that are designed specifically for professional stargazing. Even amateurs will find these lenses good for their telescopes. The orthoscopic telescopes use four lenses in the eyepiece, and have a 45 degree field of vision (FOV). Since the eyepiece is the element most important to the quality of a telescope, this design is a winner. The lenses do not strain the user’s eyes, and can be used even for viewing closer objects like planets.
For a person with a moderate budget, a Barlow lens is a viable option. The design provides average quality but is a good bargain. It does not burn a hole in one’s pocket, and yet is not of inferior quality because of its cost. The range at which this lens is available starts at a low $30 and goes up to $70. The magnification factor is generally not enough for professional use, however for amateurs it should be enough. For hobbyists, it is an ideal lens.
When you’re looking for lenses for a telescope, it is important that you determine criteria that most comprehensively fulfill your needs from the lens. Adjustable lenses is a good option as it means you can view objects which are not too far, as well as distant stars with it, and thus obtain the best deal your money can buy you.
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 ASTRONOMICAL NATURE BINOCULARS 16X50WA SHARP NEW  US $29.95
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 Super Astronomical Zoom Binocular Telescope 15 180X100 US $58.50
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 350x Astronomical Telescope BINOCULARS Binocular PW DN US $69.99
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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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 DIA STONE 11x80 COATED OPTICS ASTRONOMICAL BINOCULARS US $99.00
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Wide angle lenses have become very popular in recent years, and they have been getting wider. In the 1980s, the 35mm lens is considered to be a wide focal length, and the 24mm to be extreme wide. Today, with modern lens designs, focal lengths as wide as 17mm are becoming more and more common. As we become used to wide-angle images, manufacturers are offering wider angles to allow us to create images which look “wide”.
I find it to be too translucent and sticky. I've tried several different kinds… even the acrylic gouache is hard to use.
Barska Magnus Ed Telescopes, 560×80 Ed Glas, Refractor
Just poking fun.
It depends on the quality of video you want to upload. But for now, it's HDV that has the highest quality of video in the market, and also the most expensive. But you wont need that it you'd just be using the camcorder for personal usage.
The best kind of camcorder for home usage is miniDV, other than it's cheap, you can also easily interact with your computer by miniDV because it has pure digital signals while Digital 8 contains analog signals.
Japan’s Ricoh Co. Ltd. has announced the development of two new camera modules for its unusual Ricoh GXR camera system, which features interchangeable lens / sensor / image processor combinations that slot onto the front of the GXR camera body. The GXR body itself consists of only the LCD display, a flash strobe and hot shoe, microphone and speaker, secondary image processor, miscellaneous connectivity, battery and flash slots, plus the various control buttons and dials. It’s an interesting approach that offers a combination of advantages and disadvantages. On the plus side, the GXR’s sensor and lens designs can be tailored to each…
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The iPad requires relatively little interaction from its user — so why not put it on your belt and use a wired or wireless connection to hook up an eyepiece and earphones?
Try Mizar or Alberio.
How much will you use the telescope? What demands will you put on it? First, you decide what you're going to want to do. THEN you decide which telescope you need to do it with.
200 cm or mm? 200 cm = 2000 mm – thats fairly long. Divide 2000 by 35mm – about 60 power? work it out with a calculator
Stellarvue is dedicated to providing the highest quality telescopes, programs and experiences to enable personal discovery and foster a greater appreciation for nature and the universe. Buy direct from Stellarvue Telescopes. We also offer sale and clearance refractor telescopes, ED refractor telescopes, apochromatic apo refractor telescopes. Telescope reviews rate Stellarvue refractors as the best.
GARLIC!!
they contains allicin which is good 4 health..
but garlic is also one of hte heartburn horrors..
hmm..oh well..
go garlic!
Stellarvue is dedicated to providing the highest quality telescopes, programs and experiences to enable personal discovery and foster a greater appreciation for nature and the universe. Buy direct from Stellarvue Telescopes. We also offer sale and clearance refractor telescopes, ED refractor telescopes, apochromatic apo refractor telescopes. Telescope reviews rate Stellarvue refractors as the best.