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 Refractor80_3

Type: Refractor Doublet
Aperture: 80mm
Focal length: 400mm (f/5)

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Markus Ludes (c) 2001

Picture

Inside Focus

Inside Focus

Outside Focus

Outside Focus

“Theisdesign is a chinese made airspaced achromat, which has rather bad colorcorrection. However even such lenses can have a good spherical correction. if we compare the defocused images on both sides, we see not real big spherical problem and no real turned edge. Beside the obvious chromatic aberrations the images are quite similar  This scope is mainly designed for low power wideviews and will do in that area a pleasant job”

Markus Ludes (APM-Telescopes)