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The H-alpha nebula filters make astrophotography near cities possible and their use leads to surprisingly good image results despite the existing light pollution
This line filter blocks all other wavelengths (and thereby nearly all of the artificial light) and only the emission line of hydrogen beta will pass
The twist-up eyecups ensure comfortable viewing for users with or without glasses
Deepsky Planner
Smooth slow-motion controls allow for fine adjustments
EXOS-2/EXOS-2GT Counterweight 9.9 Pounds - Black Focal Ratio_2. f/4.1 - f/6.5 The H-alpha nebula filters makeSupplemental 9. 9 lb. Counterweight for EXOS 2 EXOS 2GT Mounts. Includes locking knob.
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