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Les, Sab and David - thanks for your supportive responses. This is such a good process to go through. I'm learning so much more in so many ways. I'm afraid, Les, that I've got an idea of what exit pupil means, but actually getting my head around its implications is another matter. I will have to do some more reading to really understand how an exit pupil of 2mm gives the best contrast. I reckon it's about time I really learned the Hubble fork as well. Sab, it sounds like a trip to the Little Desert in November wouldn't be a bad move...
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