I just like the shots of the Moon as a thin crescent with earthlight (note avatar). A 300 (read 450+ for DSLR) on a tripod would give plenty of atmospheric shots like that, and you don't have to use it at full zoom all the time, but it would be nice to be able to.
An 80mm ed would be my choice I suppose it I wanted to put a scope on the camera, but I'm afraid it is one or the other at this stage
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Tony
BTW thanks for the info re dennis Lithgo... have passed on the info.