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two-lens ED refractors or even achromatic lenses
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With a 102mm aperture and a 1000mm focal length (f/9
The narrow bandpass for the wavelengths of O-III and H-alpha and the almost complete attenuation of the interfering light sources do not require very large or extremely expensive telescopes
this eyepiece’s 6
62° Series 40mm Waterproof Eyepiece saddle-plates two-lens ED refractors or evenExplore Scientific Waterproof Eyepieces Comfort, Quality, Value. The Explore Scientific 62 Series eyepieces are excellent flat field multi element oculars that can transform your visual astronomy experience. With an apparent field of view of 62 degrees and near parfocal design, these eyepieces offer incredible value in a very nice eyepiece. Another great benefit of these eyepieces is the excellent contrast and ease with which you can gaze, not
