TPO #47 Violet Color Filter & Case - 1.25"


#47 Violet Filter:

  • Use with 8" and Larger Aperture Telescopes
  • Transmission Rate is only 3 Percent
  • Great for Discerning Fine Details in Bright Areas
  • Size: 1.25 inches


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TPO #47 Violet Color Filter & Case - 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.

Third Planet Optics 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.

#47 Violet (3% transmission): Since the #47 Violet filter strongly rejects red, yellow, and green wavelengths it is useful for the study of Martian polar cap regions and for the observation of occasional phenomena in the upper atmosphere of Venus. This filter also enhances contrast between the rings of Saturn and is useful for detecting faint features on Mercury and for observing bright comets. Use only on telescopes of 8" aperture and larger due to the low light transmission of 3%.

TPO Product Number: OS-F47



Filter TypeViolet
Free ShippingYes
Warranty2 Year Warranty
Wratten #47

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United States

Haven't had a chance to use it yet.

I bought this to use with the Atmospheric Dispersion Corrector and my mono camera. Alas, it's been cloudy since it arrived.

Larry A.


This is one of those filters that you get and then think why did I get this, I can't use if for anything. To that end it sat in my storage area for years until today that is. I woke up this morning (6/27/09 to see two dots in the eastern sky. One was ultra bright and the other while not as bright still held its own. I quickly scrambled to setup my scope to check them out and found that they were Venus and Mars. I quickly setup my telescope (130mm refractor and DMK b&w ccd. I found that the planets were Mars and Venus! I tried to shoot Mars but was too woozy from waking up. I did however get Venus. Venus is not an easy target. Its brightness washes out most of the detail. I tried a couple different combination before reaching for the literally the last filter in the box, this Violet #47. Upon putting it over the DMK nozzle the laptop screen just showed a black screen. Its very dark like thick grape juice. I put the camera on the scope and was able to shoot Venus pretty well. There was still an annoying haze around the planet so I put on a UV/IR blocking filter and presto. The image of Venus cloud structure came into view on the laptop screen. Visually it is still almost impossible to see but with a B&W ccd it stands out. For the price, you can't beat this filter as a good Venus imaging filter.