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Old 22-11-2019, 08:04 AM
robgjames (Robert)
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Join Date: May 2014
Location: Big Hill
Posts: 6
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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  #2  
Old 22-11-2019, 01:04 PM
N1 (Mirko)
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Join Date: Oct 2013
Location: Dunners Nu Zulland
Posts: 1,094
Robert, have a look on here.
Might as well use new glass. There's a 60/700 in there, among others.
A search for "achromat objective" will give more results.
Shipping is reasonably prompt and has been hassle free for me so far. Just received some nice optical glass spheres from a seller there.
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Old 02-12-2019, 07:39 AM
fsphotography (Frank)
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Join Date: Mar 2012
Location: geelong , australia
Posts: 28
60mm lens

There is a 60x700mm lens on Cloudy nights for $13 us. Add no. 191085.
Good honest seller.

Frank.
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