This No.21 Orange filter with 46% transmission helps to reduce blue-green wavelengths. Sharpens the boundaries along the plains of Mars due to the reduction of blue/green transmissions. Use on Jupiter and Saturn to enhance detail in the belts and polar regions.
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Material: Optical glass and anodized Aluminium frame
Double threaded to permit filter stacking, with standard 1.25-inch thread size
Solid construction with clean and clear optical glass which is anti-reflection coated to prevent glare and ghosting
Effectively reduce glare and light scattering, increase contrast and definition, and lessen eye fatigue
Compatible with our Barlow Lens
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