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 NPB 2.0" – DGM Optics™ Nebula Astronomy Filter US $150.00 
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 HPOIII 1.25" – DGM Optics™ OIII Astronomy Filter US $85.00
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 Astronomy Filter, "R" 635/120, 60mm, Photometric-type US $66.00
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 Optical Filter Astronomy Hb & OIII Nebula EBAY 1.25" US $69.50
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 Optical Filter 501 Astronomy OIII Narrow CCD 1.25" US $99.50
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 Astronomy Filter, 666BP7, 1.25" mount, with u/c annulus US $42.00
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 Astronomy Filter, 910BP130,50mm square x 5mm thick SDSS US $59.00
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 Optical Filter Astronomy Color Enhancing LPF 1.25" US $65.50
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 Optical Filter Astronomy Color Enhancing LPF 2.0 inch US $99.50
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 JPL Spec Attenuating Astronomy Filter, 40mm diameter US $36.00
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 Optical FIlter Astronomy 590CFLP Color Red 25mm US $19.50
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 Optical Filter Astronomy 394NB4 CaK filter 1. 25" Eyepiece US $160.00
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 NPB 1.25" – DGM Optics™ Nebula Astronomy Filter US $75.00
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 Astronomy Technologies Neutral Density Moon Filter 1.25" ATND9 US $12.95
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 Optical Filter Astronomy Na & Hg Skylight Reject 48mm US $95.50
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 Astronomy Filter, 775AF120, 1.25" dia. x 4.6mm thick US $42.00
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 Astronomy Filter, 975AF80, 1.25" dia. x 4.6mm thick US $42.00
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 Astronomy Filter, 885AF100, 1.25" dia. x 4.6mm thick US $46.00
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 Optical Filter 950LP Astronomy Mid IR 1.25" eyepiece US $89.50
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 Optical Filter Astronomy LRGB Red Color CCD 28mm 1.25 US $52.50
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 Optical Filter Astronomy LRGB Green Color CCD 28mm 1.25 US $52.50
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 Optical Filter Astronomy LRGB Blue Color CCD 28mm 1.25 US $55.50
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 Optical Filter Astronomy LRGB Blue Color CCD 48mm / 2" US $85.55
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 Optical Filter Astronomy LRGB Green Color CCD 48mm / 2" US $85.55
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 Optical Filter Astronomy LRGB Red Color CCD 48mm / 2" US $85.55
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 VHT 1.25" – DGM Optics™ Nebula Astronomy Filter US $70.00
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 Astronomy Filter, SII 2", 657DF10, latest design US $110.00
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 Astronomy Filter, Photometric "I", 70.2mm square US $95.00
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 Astronomy Filter, Photometric "R", 70.2mm square US $95.00
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 Astronomy Filter, Photometric "B", 70.2mm square US $95.00
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 VHT 2.0" – DGM Optics™ Nebula Astronomy Filter US $140.00
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 HPOIII 2.0" – DGM Optics™ OIII Astronomy Filter US $170.00
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 GCE™ 2.0", DGM Optics™Galaxy Contrast Astronomy Filter US $160.00
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 GCE™ 1.25", DGM Optics™Galaxy Contrast Astronomy Filter US $80.00
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 Optical Filter 501 Astronomy OIII Narrow CCD 2"NEW! US $129.50
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 Optical FIlter Astronomy 672.4 SII 28mm Eyepiece US $89.50
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 Optical FIlter Astronomy 672.4 SII 2 inch Eyepiece US $129.50
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 Optical FIlter Astronomy 656.3 Ha 10nm 1.25" Eyepiece US $89.50
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 HPOIII 1.25" – DGM Optics™ OIII Astronomy Filter SECOND US $68.00
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If you're thinking about purchasing a telescope, you have probably heard about refractor and reflector telescopes. Nevertheless, you might be unaware as to the differences between the two and which 1 it is best to decide on. The following will discuss both of these telescopes in additional detail. Refractor telescopes utilizes lenses to focus light into the the eyepiece. This style is located in many spotting scopes and binoculars. Instead of utilizing lenses, the reflector telescope utilizes a massive mirror to focus light on a smaller mirror. This light is then reflected into an eyepiece that is found at the best of the telescope. The Newtonian reflector is among the most well-liked of this kind and also the oldest. Stargazing is one of the most fascinating hobbies and top quality goods like the Filter Astronomy on this page will make the experience even more magical.
The telescope aperture is representative of what is commonly described as the physical 'size' of the telescope. The bigger the aperture, the extra light gathering capacity the telescope has. For instance, a recommended aperture for a seriously useful very first telescope would be at the very least 100mm for a refracting telescope, or 150mm for a reflecting telescope. Utilizing these figures, we can then calculate how faint an object an observer would be in a position to see: The entrance pupil of the human eye can reach approximately 8mm in diameter when totally adapted to the dark. This really is equivalent to an region of 50 square millimetres (50mm 2). The refracting telescope having an aperture of 100mm in diameter has an area equivalent to approximately 7850mm 2. Stargazing is one of the most fascinating hobbies and quality merchandise like the Filter Astronomy on this page will make the encounter even much more magical.
For my astronomy class, I need a flashlight with a red filter or bulb for nighttime stargazing field trips?
Why does it need to be red?
Where can I find one?
I have a Magnalite flashlight - can I just put a red bulb in it?
The answer that is simplest and to the point (accurate too), gets best answer.
Sorry, I meant Maglite. Looks like you know what I mean though. 
Red is the only colour of light which doesn't affect your night vision. Any other colour will blind you so that you won't be able to see the stars.
If you can't find a red bulb, put a drop of red nail polish on a clear bulb, or use several layers of red tissue paper, as someone else suggested.
The 100mm aperture telescope is therefore capable of collecting 7850/50 = 157x far more light, which is then accessible through the telescope eyepiece. In other words, seeking via the telescope will enable an observer to see objects which are 157 times fainter than could possibly be seen using the unaided eye. Following the very same calculation, the 150mm aperture reflecting telescope would enable the very same observer to see objects which had been 353 times fainter than could be seen using the unaided eye. Clearly then, if you would like to observe faint star fields or galaxies and nebulae, then a larger telescope aperture is absolutely far better. When you have a certain object in mind which you would like to see, then understanding how faint it is really should enable you to then 'work backwards' with the above calculation, to decide if the telescope you've got would be suitable.
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 will be observed), using the objects in that field of view appearing smaller, whereas a lengthy focal length will give a narrow field of view, but with the objects appearing bigger. The magnification of the telescope is the result of a combination of the focal length of the telescope itself, and focal length of the telescope eyepiece. A telescope of a specific focal length will create an image of a specific size, which is fixed and won't vary. The eyepiece, successfully applied as a microscope, then views that image. A larger image to start with makes it possible for the eyepiece to generate a greater magnification. So, by altering the eyepiece, the magnification of the telescope can also be changed. Stargazing is one of the most fascinating hobbies and quality products like the Filter Astronomy on this page will make the experience even extra magical.