I dont have the Mak so I cant answer for the ETX 125
however set up and alignment 15 to 20 minutes
probably will take twice or three times as long if you are a complete novice
cool down-any Mak needs 30 minutes min? just guessing probably even longer
be warned the people who have taken decent images with an ETX 125 have -many of them-mounted the OTA piggyback on another scope/mount
the ETX is hardly designed for long exposure imaging
much better on planets though
also be warned that the ETX will not support the weight of a digital SLR at prime focus-you could quit easily do serious damage to the gears-which are after all nylon. You can piggy back a DSLR though and take some nice widefields
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