User manual ORION TELESCOPES & BINOCULARS POLUTFILTR

[. . . ] SkyGlow & UltraBlock Light-Pollution Filters TM TM #5661 #5660 #5659 #5658 #5654 #5655 #5657 #5656 . 965" SkyGlow Broadband Filter 1. 25" SkyGlow Broadband Filter 2" SkyGlow Broadband Filter SkyGlow Broadband Filter for Schmidt-Cassegrains 1. 25" SkyGlow UltraBlock Filter . 965" SkyGlow UltraBlock Filter 2" SkyGlow UltraBlock Filter SkyGlow UltraBlock Filter for Schmidt-Cassegrains The SkyGlow UltraBlock Filter is a Narrow Band Transmission Filter with very high (99. 9%) blocking of Mercury and Sodium emission pollution bands, and very high transmission of critical Hydrogen Beta and Ionized Oxygen. It is most useful in areas of extreme light pollution like cities and busy streets. [. . . ] The filter provides the same threads as the rear cell of your Schmidt-Cassegrain, so you can continue to use any of your standard accessories as before. The Importance of Dark Adaptation Allowing your eyes to dark-adapt is the key to getting the most from your SkyGlow filter. Allow your eyes to dark-adapt for about 20-30 minutes before you use the filter. Once the pupil in your eye opens up, you'll be able to take full advantage of the benefits of the filter. Remember, the instant you glance at a bright object like a street lamp or bright flashlight bulb, your eyes lose their dark adaptation. You have to wait another 20-30 minutes for it to return. Locate the scope away from direct illumination by street lights. Set up in the "shadows" of buildings and other objects, or, better yet, use Astrogoggles. What You Will See These filters improve contrast between sky and object but will not actually make the object brighter. Expect a very dark sky background and a somewhat dimmer but high-contrast image. The filters perform best on emission objects like the Orion and Trifid nebulas in winter, and the Lagoon or Dumbbell nebulas in summer. Use these for your first use of the filter. Our SkyGlow and UltraBlock filters improve the contrast of most objects, but have considerably less effect on galaxies and stars. [. . . ] If the glass surface accumulates oily dirt, use lens cleaning fluid and tissue as instructed in their package directions. 100 Transmission Characteristics of Orion Broadband Skyglow Filter 80 20 Wavelength (nm) 0 100 Oxygen III 40 Hydro-gen Beta 400 450 500 550 600 650 Hydrogen Alpha 700 80 Transmission (%) Transmission Characteristics of Orion Narrowband UltraBlock Filter 60 20 Wavelength (nm) 0 Oxygen III 40 Hydro-gen Beta 400 450 500 550 600 650 Hydrogen Alpha 700 Common Light Pollution Emissions q q q vs q q qv q Mercury Street Lights, s Sodium Street Lights, v Ionized Oxygen Skyglow Customer Support (800) 676-1343 Email: support@telescope. com Providing Exceptional Consumer Optical Products Since 1975 Corporate Offices (831) 763-7000 P. O. Box 1815, Santa Cruz, CA 95061 IN 020 0697 [. . . ]