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Re: ATM Appropriate barlow ?s
I would also like to see some kind of Barlow formula that describes the
negative lens focal length, factored with the distance to the eyepiece =
amplification.
Dave
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From: Glen Warchol <glenwarchol@sltrib.com>
More specifically, how about a Sam Browne-esque formula for figuring out
tube lengths for the various surplus achromats that pop up on the market.
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