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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #163510

For Sale: 20" f:7.5 Ritchey -Chretien Optics - Brand New

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Its a long story but suffice it to say that this perfect set of R-C optics was made by Paul Jones of Star Instruments for a 0.5m robotic telescope I had commissioned in 2000. I have since decided to upgrade to a 0.6m. This set is brand new in its shipping crate. Some of the specs are:

Size,Type: 20" f:7.5, Ritchey-Chretien
Material: Astrosital Primary and Secondary
Focal Length: 150"
Spacing: 31.5"
Back Focus: 11"
Figure RMS: 0.0363 wave at 633nm
Figure P-V: 0.249 wave at 633nm
Strehl Ratio: 0.950

There are some specs I still have to get such as central hole diameter, weight, and coatings info. Phase Map and other plots available on request. Why wait a year to have it made when you can own it now for $14,500.


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