These cameras can tend to overexpose the image because there is a lot of black surrounding the moon. If you do a lot of lunar viewing and have a 2″ diagonal or 2″ eyepieces, this is the filter you really want.īelieve it or not these filters are also useful with beginner astrophotography with cameras that do not have manual exposure settings. It also substantially cuts out light scatter which greatly enhances contrast. Just like their 1.25″ version, this Orion 5562 2-Inch Variable Polarizing Eyepiece Filter allows you to vary the light transmission from 1% to 40% making sure you can get the exact amount of light you want for your viewing conditions. Orion 5562 2-Inch Variable Polarizing Eyepiece Filter $70 This filter is built very well and is optically excellent featuring a metal filter cell and good optical glass. If you have a telescope using 2″ diagonal or 2″ eyepieces then it is probably not a small telescope so you need a 13% filter at a minimum like this Orion 05594 2-Inch 13 Percent Transmission Filter. Orion 05594 2-Inch 13 Percent Transmission Moon Filter $30 Have a 2″ diagonal or 2″ eyepieces? Then you need a 2 inch moon filter. It manages this while reducing light scatter which increases contrast substantially. Orion 5560 1.25-Inch Variable Polarizing Filter $38įor the ultimate in control this Orion 5560 1.25-Inch Variable Polarizing Moon Filter allows you to control the amount of light passing through from 1% to 40%. I have used one of these for years and it works very well. Just like the Gosky it has a metal filter cell and optical glass which cuts the light while not affecting the color. If you want something that doesn’t block quite as much light such as for smaller telescopes this Orion Moon Filter 05598 1.25-Inch 25 Percent Transmission is an excellent choice. Orion 05598 1.25-Inch 25 Percent Transmission Moon Filter $21 Gosky also gives you a full year warranty so if you have any problems you can get it taken care of. Less expensive models typically have plastic threads and/or plastic optics. With an aluminum frame and actual optical glass is is much higher quality than some others in its price range. The Gosky 1.25″ 13% Transmission Filter is an excellent choice for your first filter. Gosky 1.25″ 13% Transmission Moon Filter $16 If you have a 1.25″ diagonal or only 1.25″ eyepieces then these are the filters you need. This range is much darker on one end and much brighter on the other end than traditional filters so it makes them perfect for any type of telescope with any aperture.Īnother advantage of the polarizing filters is that since the light is no longer scattered, the image appears much sharper and clearer. Polarizing filters have a range of light adjustment which can go from around 1% to 40%. This allows you to get just the right amount of light. When rotating you will see the image appear to darken and then lighten again. Since the moon tends to scatter the light it reflects from the sun, these work surprisingly well but are more expensive.Īdjustment of a polarizing filter is done by rotating the two pieces of the filter (top and bottom) which in turn rotates the two pieces of glass inside the filter. These filters work by removing light coming in at angles and only allowing light coming straight through the filter. Smaller telescopes like a refractor or small Newtonian might be better off with a 25% model.Ī polarization filter is generally variable moon filter allowing you to change the amount of light removed to suit your tastes. Larger telescopes such as medium to large Newtonians and Dobsonians typically have brighter images so a lower number filter such as the 13% is the preferred filter.
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