Optical filter #21 (Orange) is perfect for observations of the solar system planets and their satellites. With this filter you will be able to study the tiniest details of observed celestial objects. Optical Filter #21 (Orange) blocks blue green parts of the spectrum and transmits up to 56% of visible light. This filter has a barrel so it can be used with telescopes of any brand.
- Lunar and planetary observations
- Orange color
- Made in the USA
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