250 mm F/20 Toro Kutter telescope by Rik ter Horst

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06-Dec-2012

250 mm F/20 Toro Kutter telescope

Sketch of my 250 mm F/20 Toro Kutter telescope as built around 1998, which makes use of a torical secondary instead of a weak corrector lens to eliminate astigmatism and coma

LG Electronics LG-P990
1/50s f/2.8 at 4.5mm iso100 full exif

other sizes: small medium large original auto

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