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Great shots guys! I'm going to have to get myself a piggy-back adaptor. What do you think the max exposure would be for a Nikon D70 with a 200mm lens piggy backed on an LX90 in alt-az before field rotation would become apparent. Apparently it's about 30 secs at prime focus (2000mm), so at 200mm (one-tenth) would that mean ten times the exposure (about 300 secs)?
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