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I have used the SA with an 800mm f8 lense that weighs 3.5 kg plus camera On M42. The 400mm f4 too.
Worked ok if the polar alignment is good and the exposure time is limited to 40 sec or less. Good to travel with for wide angle. I use iso 400 as my noise is less at 400 but 800 works. The SW polar clock utility on your phone is helpful as you do not need to use the polar scope time settings.
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