Re: spotting scope question-specific

nicebrid wrote:
thanks to all who replied. too bad each manufacturer has to have their own
name for high end glass, confusion factor.

Does anyone know how ling the various manufacturers have been using these
newer glass formulations in spotting scopes? I ask as I am very fortunate to
have startlingly accute vision, I suspect I would notice the difference
instantly. I may have to find a used scope, however long that will take, as
the big names new with high end glass is rather pricey.
Any further info much appreciated.

...

The new low-dispersion glasses come close to good classic apochromatic (apo) designs, but don't quite match them. If you find a used apo scope in your price range, don't hold out for something more modern.

Not much of the cost of a good lens, let alone a scope, is in the glass. The cost is in the shaping and polishing. Lenses with low-dispersion glass command a higher price because of their better performance, not because of higher per-unit manufacturing cost. We are still in the time of retiring development costs and milking the market for the just rewards or entrepreneurship, but I expect LD prices to fall eventually to where they drive crown-flint achromats off the market. Have you noticed that nowadays most lenses are multi-coated as a matter of course? That was a high-end treatment not long ago.

Jerry
--
Engineering is the art of making what you want from things you can get.
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