The main fact to find out is

Forums Telescopes Mystery lens and optics tube? The main fact to find out is

#585135
Denis Buczynski
Participant

The main fact to find out is whether the optical design of the 7 inch you have found is a Petzval doublet or a Zeiss triplet(telephoto) . The original Zeiss triplet on the Mond was a triplet of f/7. Cooke mounted the Zeiss lenses onto the Mond astrograph for Robert Mond.I would look for some markings on the lens cell/housing which may show it to be a Zeiss.

Denis