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Thanks Brendan. yeah interesting on the 10 inch. Perhaps an 8 inch would be more appropriate for what I'm looking for.
Thing is, I notice that the 8 inch Skywatcher dobsonians on sale have 1200mm focal lengths (these are SW680 models?), whilst the 8 inch tubes on the HEQ5 mounts have 1000mm focal lengths (SW600 models?).
If I were to buy an 8 inch dob now, and later attach it to an HEQ5 mount then I'd prefer getting the 1000mm long version. Is it possoble to find a Skywatcher dobsonian setup with the 1000mm length? If not is it easy to organise one with a shop?
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