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 Solar Sun Filter Telescope Sheet Black Polymer 12"x12" US $22.99 
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 Telescope Solar - Sun Filter (425P1) fits Meade ETX 90 US $49.00
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 Telescope Solar - Sun Filter (750P1) fits NexStar 6/6SE US $69.00
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 Telescope Solar - Sun Filter (600P1) Fits Meade ETX 125 US $59.00
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 Solar Sun Filter Telescope Sheet Black Polymer 10"x10" US $19.99
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 Solar - Sun Filter (500P1) fits ETX 105, DSX102, & 2045 US $49.00
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 Eschenbach Solar Shields Sun Glasses Large Amber Filter US $33.59
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 Eschenbach Solar Shields Sun Glasses Large Plum Filter US $33.59
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 Eschenbach Solar Shield Sun Glasses Small Plum Filter US $33.59
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 Eschenbach Solar Shield Sun Glasses Medium Amber Filter US $33.59
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 Eschenbach Solar Shields Sun Glasses Large Gray Filter US $33.59
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 Eschenbach Solar Shield Sun Glasses Medium Plum Filter US $33.59
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An investigation into early telescopes makes for intriguing reading. In 1722, John Hadley, an English mathematician, completed a type of reflector for the telescope inside the style of Newton in which the mirror evidently was suitably figured. This instrument attracted considerable attention, and presently other makers were turning out Newtonian reflectors, following Hadley's strategy, which consisted of removing the spherical aberration as it was revealed by the extra-focal diffraction rings of a star image.
Both of these kinds have their benefits and disadvantages. The 1 you should pick out is based on what you might be going to be utilizing it for, in addition to just how much dollars you've to spend. Among the main advantages of a refractor telescope is that mainly because the tube isn't open and you do not need to adjust a mirror, there is pretty much no maintenance involved. The high models of this type have probably the most rugged designs, even though also producing images which can be among the sharpest and brightest that you will obtain per inch. Since the eyepiece is at the bottom where shorter individuals can see, this scope is nicely suited for children in addition to the reality that they're built strong.
does solar filter really help you when you look at the sun with a telescope?
because today i looked at the sun with my telescope and with out the solar filter. it's like at noon. then after 10 second, my eyepices get burned. so can you tell me when to look the sun and does solar filter really works? if yes, tell me a web that i can buy the filter. from wal-mart is ok. or other markets
i have a celesrton nexstar 130slt computerlized telescope. thanks
i want cheep. and i just wan the solar filter. thanks
i am not blind, it's 3 meters away from me, the the clouds cover the sun
STOP!!!! DON'T DO THAT!!!!!
You are risking permanent blindness!
Even a second at the eyepiece of a telescope pointed at the Sun is enough to cause permanent irreversible damage to your eye. And you won't even know it's happening because there are no pain receptors on your eye's retina.
A solar filter is absolutely essential for observing the Sun with a telescope. These are made from glass or plastic film coated with a highly reflective coating. You can buy such filters from any astronomy store, I prefer the filters made by Kendrick because of their safety features:
http://www.kendrickastro.com/astro/solarfilters.html
However, I would recommend holding off on buying a solar filter until the Sun's activity returns to normal. We are in an extended solar minimum at present, and there literally is nothing to see on the Sun at present.
There is no such thing as a cheap solar filter: your eyesight is too precious to risk it on a cheap filter. Get a Kendrick, Celestron, or Orion brand filter. Nothing suitable is sold at Wal-Mart.
The 100mm aperture telescope is consequently capable of collecting 7850/50 = 157x far more light, which is then accessible through the telescope eyepiece. In other words, searching via the telescope will enable an observer to see objects that are 157 times fainter than might be observed using the unaided eye. Following the very same calculation, the 150mm aperture reflecting telescope would enable the identical observer to see objects which were 353 times fainter than could possibly be observed with the unaided eye. Clearly then, if you would like to observe faint star fields or galaxies and nebulae, then a bigger telescope aperture is absolutely greater. When you have a specific object in mind which you'd like to see, then realizing how faint it can be ought to permit you to then 'work backwards' using the above calculation, to ascertain if the telescope you've would be appropriate.
The focal length of the telescope is representative of either the physical 'length' of the telescope, or its optical configuration. A short focal length will give a wide field of view (the area of night sky that could be seen), with the objects in that field of view appearing modest, whereas a lengthy focal length will give a narrow field of view, but with the objects appearing bigger. The magnification of the telescope may be the result of a combination of the focal length of the telescope itself, and focal length of the telescope eyepiece. A telescope of a particular focal length will generate an image of a particular size, which is fixed and won't vary. The eyepiece, effectively applied as a microscope, then views that image. A bigger image to start with enables the eyepiece to create a greater magnification. So, by altering the eyepiece, the magnification of the telescope can also be changed. Stargazing is among the most fascinating hobbies and high quality items like the Solar Sun Filter on this page will make the expertise even extra magical.