High Point #15 Deep Yellow Filter - 1.25"
This #15 Dark Yellow Filter, 67% transmission by High Point Scientific is an invaluable aid to lunar and planetary observing. This filter will reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue. The Deep Yellow Filter has a Wratten number of #15 and can help you view features on the Moon and Venus. When observing Jupiter and Saturn, a yellow filter can enhance your view of the orange and reddish features of the belts and zones. With a transmission of 83%, this yellow filter will also enhance definition in comet tails and atmospheric currents. Mars will also benefit from a yellow filter in many ways. It will darken the maria, canal markings and oases, and lighten desert regions. A yellow filter will also sharpen the boundaries of Martian dust clouds. If you have a telescope with at least 11" of aperture, you can use a yellow filter to improve detail on both Neptune and Uranus.
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 1.25" 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 #25 Red with just 14% transmission, or the #38A Blue with 17% transmission.
1.25" #15 Deep Yellow Filter
Dimensions & Specifications
Model Number: 15F1
Filter - Single or Set: Single Filter
Filter Size: 31.75 mm (1.25")
Filter Type: Planetary Color
Filter Shape: Round
Mounted or Unmounted: Mounted
Wratten Number or Equivalent: #15 Deep Yellow
Filter Warranty: Two Years
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