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P3D Re: negative lens for distance

Thanks for the thoughts--looks like - 1/4 diopter looks like the way
to go if the "official" Nimslo distance lens doesn't turn up (someone
told me it is still available--haven't gotten a reply on that yet).
Or perhaps someone will tell me something more precise (although if
opticians work only in 1/4 diopter increments, it may be of only
theoretical value).

Mark

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