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View Full Version here: : 120 mm F/12.5 doublet

AstroApprentice
15-01-2020, 05:45 AM
Rare to see someone making what appears to be a quality long focus doublet...
http://www.frtelescopes.com/frt120ded.html
Wavytone
15-01-2020, 07:36 AM
Agreed - a good find too ... but hard to mount and probably $7k here for what is still only a 5” aperture.