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Maximum aperture and focal length which can pass full disk
480mm focal length refractor
Explore Finder Scope Base installed on scope
astrophotography
Explore Scientific 2" Field Flattener for ED APO with Nikon T-Mount Focal Length_1200 - 1399mm Maximum aperture and focal length2" Field Flattener A curved focal plane is an inherent feature in most telescope designs and is nothing to note for general stargazers. But, for astrophotographers, the consequences of that same curved plane can ruin hours of patient imaging. Designed for refracting telescopes, Explore Scientifics Field Flattener can tackle the edge of field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain.
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