User manual ORION TELESCOPES & BINOCULARS SKYGLOW ULTRABLOCK
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Manual abstract: user guide ORION TELESCOPES & BINOCULARS SKYGLOW ULTRABLOCK
Detailed instructions for use are in the User's Guide.
[. . . ] SkyGlowTM & UltraBlockTM Light-Pollution Filters
#5660 #5659 #5658 #5654 #5657 #5656
1. 25" SkyGlow Broadband Filter 2" SkyGlow Broadband Filter SkyGlow Broadband Filter for Schmidt-Cassegrains 1. 25" UltraBlock Narrowband Filter 2" UltraBlock Narrowband Filter UltraBlock Narrowband Filter for Schmidt-Cassegrains
The SkyGlow and UltraBlock Series of filters allows light from nebulas and other deep-space objects to pass through them while blocking light from street lights and other undesirable light sources. The SkyGlow Broadband Filter is useful in areas of moderate light pollution like nearby street lights. [. . . ] Mounting the Schmidt-Cassegrain Filter Thread the filter onto the rear cell where you normally attach your visual back or T-adapter. 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 light pollution filter. Allow your eyes to dark-adapt for about 20-30 minutes
80
Transmission (%)
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. Locate the scope away from direct illumination by Transmission street lights. Set up in the "shadows" Characteristics of of buildings and other objects. Orion Broadband
Skyglow Filter
60
20
Wavelength (nm)
0 100
Oxygen III
40
400
450
500
550
600
650
700
80
Transmission (%)
Transmission Characteristics of Orion Narrowband UltraBlock Filter
60
Oxygen III
40
Hydro-gen Beta
Hydrogen Alpha
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 highcontrast image. [. . . ] Keep the filter in its protective storage box when you are not using it. If the glass surface accumulates oily dirt, use lens cleaning fluid and tissue as instructed in their package directions.
20
Wavelength (nm)
0
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
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