Quote:
Originally Posted by alpal
Hi Mike,
I remember reading somewhere that a classical Cassegrain can be corrected
to be superior to a Ritchey-Chrétien.
cheers
Allan
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I have always liked the Philip Keller corrected Cassegrains, ever since seeing
Johannes Schedlers (one of the CHART32 team) 16"corrected F10 Cassegrain/F3 prime focus combo unit..I used to to drool over it
it was taking some of the Worlds best deep sky images in the early-mid 2000's. I have also seen Tim Curruthers
20" Keller corrected Cassegrain at Savanah Skies, Keller makes excellent telescopes!
Mike