TPO #23A Light Red Filter & Case - 1.25"

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TPO #23A Light Red Filter & Case - 1.25"
$8.95
Item # OS-F23A
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  • The TPO #23A Light Red Filter is similar to the #21 Orange Filter, but offers increased contrast.
  • The 23A enhances detail in the belts and polar regions of Jupiter and Saturn, plus helps you see Mercury during daylight hours by increasing the contrast between the planet and the blue sky.
  • The TPO #23A Light Red Filter comes with a hinged, plastic case. Best for telescopes with 6" of aperture or more due to low light transmission of 25%.
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TPO #23A Light Red Filter - 1.25"



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. All eyepiece filters are threaded to fit most 1.25" eyepieces and offer a full 26mm clear aperture. Comes with a hinged, plastic case to keep your filter safe and clean when not in use.

#23A Light Red (25% transmission): On telescopes of 6" aperture and larger the #23A does approximately the same functions as the #21 filter, but with stronger contrast and enhancement of marginally defined blue-green surface detail. Useful primarily on Jupiter, Saturn, and Mars. Increases contrast between Mercury and bright blue sky during daylight observations or during twilight.

TPO Product Number: OS-F23A

Additional Information

Additional Information

SKU OS-F23A
Manufacturer TPO
Type of Filter Color, Planetary
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 1.25"
Filter Shape Round
Filter Mounted? Mounted
Warranty 90 Day Warranty
Wratten # 23A
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Included Items

Included Items

  • TPO #23A Light Red Filter - 1.25"
  • Plastic Storage Case
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