TPO #25 Red Color Filter & Case - 2"


#25 Red Filter:

  • Strongly Blocks Blue and Blue-Green Wavelengths
  • Best for 8-inch and Greater Aperture Telescopes
  • Fits Most 2-inch Eyepieces
  • 14% Transmission
  • Sale
  • Regular price $18.95

More on the Way in 14 - 28 Business Days

Free Shipping
Add to Wishlist
Already have gear? Trade it in for cash or new equipment.

Accessories Added

OPT Telescope Expert

Want Help?

Ask Our Telescope Experts


TPO #25 Red Color Filter & Case - 2"

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-inch eyepieces and other accessories with 2-inch 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


Filter TypeRed
Free ShippingYes
Warranty2 Year Warranty
Wratten #25
Customer Reviews
5.0 Based on 1 Reviews
Write a Review Ask a Question
  • Reviews
  • Questions

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
United States United States
A decent performer at a great price

I have been using this filter with my night vision goggles as a lower cost alternative to full cut-off filters. I find it perfectly suited for my current setup, though I may upgrade at some time in the future.