Scope repair Broadhurst Clarkson 3"
I recently purchased a rather sad brass refractor on AltAz mount w tripod. The lens is broken and missing.
It is a Broadhurst Clarkson 3” “Advanced Starboy”. The mount is probably a modified Unitron from the early 50’s so I expect the scope dates from that time also.
I am happy with making a replacement lens for this scope, but am finding the original focal length hard to nail down. If anyone has a intact scope of this type, I would be very interested to know it’s focal length. (My estimate is 1100mm, f14.5)
Further, I have no knowledge of it lens design. Possibly it was a coma free design as there is no provision for collimation. (Fraunhofer or Littrow are probables)
If any one has specific knowledge, or actually owns one of these scopes I could examine, I would like to hear from you.
Len.
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