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Orion Telescopes
Orion 1.25" Mars Observation Eyepiece Filter Set
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  • 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

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Item #  05591

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.


Limited Warranty against defects in materials or workmanship for one year from date of purchase. This warranty is for the benefit of the original retail purchaser only. For complete warranty details contact us at 800-676-1343.


Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.

Product Support
Visit our product support section for instruction manuals and more

Orders received by 1pm Eastern Standard Time for in-stock item the same business day. Order received after noon will ship the next business day. When an item is not in-stock we will ship it as soon as it becomes available. Typically in-stock items will ship first and backordered items will follow as soon as they are available. You have the option in check out to request that your order ship complete, if you'd prefer.

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