The Keplerian design does have the downside ... and the majority of refracting telescopes are designed this way, even today. Early telescopes were all refracting telescopes of the kind Galileo ...

The original instrument to occupy the 25-foot diameter dome was the 10.5-inch Bausch refracting telescope (f/15.5) installed in the brand new observatory in 1953. Bausch & Lomb Company gave the ...