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High Point #47 Violet Filter - 1.25" - 47F1


High Point #47 Filter - 1.25"

This Violet 1.25" eyepiece filter has a Wratten number of 47 and a very faint transmission of 3%. To use this filter, you will need at telescope with an aperture of at least 8" - 10" in diameter, as it blocks all but 3% of the light reaching your eye.

A violet filter will help with observations of Venus by revealing the dark shading that is present in the upper atmosphere. You can also use the #47 Violet filter during violet clearing on Mars and for detecting high clouds and haze over the polar ice caps. It is interesting to study the ring structure around Saturn or the features on Mercury. Lunar features can be enhanced, and you can even study brighter comets.

Colored filters can be 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.

All of High Point's colored filters are made of high quality, solid plane parallel glass that has been anti-reflection coated to prevent glare and ghosting. They have a full 26mm clear aperture, and are mounted in a black anodized aluminum cell that is threaded on both sides to fit most eyepieces and stack with each other.

Please note that the effectiveness of this filter depends on several factors, including the aperture and focal length of your telescope, the magnification being used, and the seeing conditions at the time. Remember that filters lower the amount of light that reaches your eye. You'll need an aperture of at least 8 inches for dark filters such as the #47 Violet, with only 3% transmission, the #29 Deep Red with 6% transmission, or the #38A Blue with 17% transmission.