Exoplanet filter 50x50 mm (Astrodon) + 2 yellow cutoff filters (Schott)
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Three astronomical filters, especially suited to photometry of exoplanets and of asteroids:
Astrodon exoplanet / BB (blue-block) filter, 50x50 mm, serial number 10003167 (at center in photo).
Schott GG495 yellow / blue-block filter, sharp cut-off at 495 nm wavelength, 50 x 50 mm (at left).
Schott GG475 yellow / blue-block filter, sharp cut-off at 475 nm wavelength, 50 x 50 mm (at right).
The Schott filters were used to reduce sky brightness, especially from skyglow caused by moon phases near full, while little reducing light flux from asteroids. Their surfaces are uncoated glass, but this never impeded their use over years of asteroid precision photometry.
All 3 filters have been professionally maintained in very dry New Mexico observatory conditions. All are in excellent condition.
I recently sold my telescope equipment, so I make these filters available. I will ship pre-paid to US lower 48 states via UPS 2-day air; will ship on next business day after payment received. PayPal is accepted without surcharge to buyer
Astrodon exoplanet / BB (blue-block) filter, 50x50 mm, serial number 10003167 (at center in photo).
Schott GG495 yellow / blue-block filter, sharp cut-off at 495 nm wavelength, 50 x 50 mm (at left).
Schott GG475 yellow / blue-block filter, sharp cut-off at 475 nm wavelength, 50 x 50 mm (at right).
The Schott filters were used to reduce sky brightness, especially from skyglow caused by moon phases near full, while little reducing light flux from asteroids. Their surfaces are uncoated glass, but this never impeded their use over years of asteroid precision photometry.
All 3 filters have been professionally maintained in very dry New Mexico observatory conditions. All are in excellent condition.
I recently sold my telescope equipment, so I make these filters available. I will ship pre-paid to US lower 48 states via UPS 2-day air; will ship on next business day after payment received. PayPal is accepted without surcharge to buyer
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