Used Orion Mars Filter Set 1.25"

SKU: U2203-LM-ORN-05591

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  • $40.00
  • Regular price $72.95

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Not Returnable Please note that used items are not returnable.

This is a used Mars Filter Set in very good condition, with clean optics.  Get ready for the next Mars opposition of December 2022!  


  • Unique set of high-performance observational filters markedly improve views of Mars through your telescope
  • Fully-coated Mars filter increases contrast to bring out subtle detail, even in smaller telescopes.
  • Included Blue #82A filter enhances low-contrast detail and Orange #21 filter accentuates dark surface markings.
  • You'll see the polar ice cap, subtle mare shadings, and cloud activity with this thorough complement of Mars filters for telescope eyepieces
  • All filters feature metal filter cells and are threaded to fit 1.25" telescope eyepieces - hard plastic filter case included

You may not see little green guys with antennae, but you will resolve plenty of subtle features with this Orion Mars-optimized telescope filter set. It consists of three 1.25" glass filters in threaded aluminum cells:

  1. The custom-designed Orion Mars Observation filter enhances contrast of virtually all surface features. Dielectric coatings transmit violet/blue (< 505nm) and orange/red (> 615nm) wavelengths where detail is rich, while blocking overbearing yellow/green (515nm-615nm) wavelengths. Polar icecaps appear more sharply defined, and differences in landscape shading are nicely resolved. Polar hazes and cloud cover become visible. The filter's high transmission makes it effective even in small telescopes.
  2. The Blue #82A filter really "pops" the polar icecaps and nicely highlights polar hoods and clouds.
  3. The Orange #21 filter sharpens visibility of dark surface markings and polar regions. Surface dust storms become easily visible.
  4. Set includes 3-filter case.