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Objective Lens 55-60.5 Diam, 700-750mm Focal Length
I'm restoring a very old (circa 1800) Blunt library telescope of nominal 2" size and am having trouble finding a physically compatible objective lens (the original broken and long gone). It should ideally be an achromatic doublet with key parameters 55-60.5mm actual Diam so as to fit the mounting, and 700-750mm Focal Length to achieve focus.
Please let me know if you can supply anything suitable. The objective is the most important part, and I would love to find something of the era, but I'm resigned to most likely having to use a modern lens, quite possibly from a low cost telescope as there were a few around these specs - they just havent been turning up lately.
I'm also on the lookout for any old brass eyepieces - particularly pre 1900 if by chance you have any to sell.
Regards Rob
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