field de rotators

[p1taylor]

Hi all
I wont to do 5 to 15 minute exposures, can I do this with a field de rotator, because shed is not tall enough to us a wedge, scope is 10"rcx
peter

[renormalised]

If the shed is so tight and you can't use a wedge, then a field de-rotator will be alright. I wouldn't try pushing the exposure length any longer than 15 minutes or so, just in case, but if it's setup and trained properly longer exposures shouldn't be out of the question. Experiment and see what you get.