High Point #29 Deep Red Filter - 1.25"
This #29 Deep Red Filter, 6% 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 Red Filter has a Wratten number of #29 and can help you view surface features on Mars, such as polar ice caps. When observing Jupiter and Saturn, this filter will help you study clouds with a bluish hue. With a transmission of just 6%, this deep red filter is perfect for daytime viewing of Venus and Mercury by darkening the blue sky. You will need a telescope with an aperture of at least 8" for ample light transmission.
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" #29 Deep Red Filter
Dimensions & Specifications
Model Number: 29F1
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: #29 Deep Red
Filter Warranty: Two Years
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