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Thank you all SO much for your responses, opinions, information, and links. I'm blown away by the quantity. I'll have to print it all so I can peruse it at my leisure. Incidentally,Mike said that an image of
M81 taken with a DSLR was the best he had seen of that object; well
the best M31 I have ever seen was taken a long time ago, on film, by
Daphne and Tony Hallas. I have yet to see an amateur digital version
to equal it. Thanks once again for your encouragement.
raymo
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