TPO #38A Dark Blue Color Filter & Case - 1.25"

TPO #38A Dark Blue Color Filter & Case - 1.25"
Item # OS-F38A
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  • If you like studying Jupiter and the Moon, you'll want to pick up this TPO #38A Dark Blue Color Filter!
  • Since the dark blue (17% transmission) #38A Filter rejects orange and red wavelengths, it helps you see the Great Red Spot. This filter also works well on Mars and Saturn, and even brings out subtle cloud structure on Venus.
  • The TPO #38A Dark Blue Color Filter fits 1.25" eyepieces and other accessories with threaded 1.25" barrels.
  • Comes with a hinged, plastic case for storage and protection.


TPO #38A Dark Blue Color Filter

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 1.25" eyepieces, and comes with a hinged, plastic case to keep your filter safe and clean when not in use.

#38A Dark Blue (17% transmission): A popular filter for the study of Jupiter’s disc, owing to the filter’s strong rejection of orange and red wavelengths. Increases contrast between the reddish belt structures and enhances detail of the Red Spot. Also useful for the study of isolated phenomena, such as dust storms, on Mars, as well as the belt structure of Saturn. Increases contrast of subtle cloud markings on Venus.

TPO Product Number: OS-F38A

Additional Information

Additional Information

Manufacturer TPO
Type of Filter Color
Filter Usage Imaging, Visual
Single or Set? Single Filter
Filter Size 1.25"
Filter Shape Round
Filter Mounted? Mounted
Warranty 90 Day Warranty
Wratten # 38A
Included Items

Included Items

  • TPO #38A Dark Blue Filter in 1.25" metal cell
  • Plastic case
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