TPO #25 Red Color Filter & Case - 2"

TPO #25 Red Color Filter & Case - 2"
Item # OS-F2-25
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  • The TPO #25 Red Color Filter is a nice choice for allowing the polar ice caps on Mars to contrast more strongly against the maria.
  • This #25 Red Filter lets only 14% of the light through and so works best for larger telescopes of 8" or more.
  • The TPO #25 Red Color Filter fits 2" eyepieces and other accessories with threaded 2" barrels.
  • Comes with a hinged, plastic case for storage and protection.


TPO #25 Red Color Filter for 2" Eyepieces

Eyepiece filters are an invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue.

TPO filters are made of high quality, solid plane parallel glass with excellent homogeneity. They are anti-reflection coated to prevent glaring and ghosting. This eyepiece filter is threaded to fit most 2" eyepieces and other accessories with 2" barrels, and comes with a hinged, plastic case to keep your filter safe and clean when not in use.

#25 Red (14% transmission): The #25 filter strongly blocks the transmission of blue and blue-green wavelengths, resulting in very sharply defined contrast between, for example, blue-tinted cloud formations on Jupiter and the lighter-toned features of the disc. Also useful for the delineation of the Mars polar ice caps and maria. Because of its relatively low total light transmission the #25 filter should be employed on telescopes of 8" aperture and larger.

TPO Product Number: OS-F2-25

Additional Information

Additional Information

SKU OS-F2-25
Manufacturer TPO
Type of Filter Color
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 2"
Filter Shape Round
Filter Mounted? Mounted
Warranty 90 Day Warranty
Wratten # 25
Included Items

Included Items

  • TPO #25 Red Filter in 2" metal cell
  • Plastic case
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