|
With an OAG and accurate polar alognment to prevent field rotation there should not be a mechanical limit to the length of the exposure. The limit will be noise and wasted time with cosmic rays, planes, satellites etc.
I never bother going over 10 mins for these reasons. The amount of signal is the same with 6 x 600 sec exposures vs 3600 sec but the noise will be different depending on lots of different factors.
An interesting experiment to try though.
|