Learn how eyepiece field of view affects what you can see, even when focal length remains the same. Dr. D of www.telescopes.net gives you a quick run down on apparent field of view and true field of view to help you better select your eyepieces.
Explore Scientific 100 degree eyepieces can be found at https://telescopes.net/store/manufacturer/explore-scientific?cat=838&eyepiece_field_of_view_f=1937
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what is the true field of view for the 20mm 100 degree?
thanks