Sorry about this double posting. I have DDM60 but is very interrested in what DDM85 owners can report!
I urge all of you that read this to take 30s and answer!
2 cloud free months to anyone that answers!
I cant reliably.And I feel I should be able to do even longer with my setup.
( 1 arcSec/pixel is scaled down or binned - ofc - for you guys with monster resolution)
My system is dome with permanently mounted DDM60Pro+N10 and atik 460+filterwheel.The extra big ASA focuser.
If you can do 20min unguided, please give a short description of your hardware.
PS. A long description of my workflow, I'd appreciate any tip on bettering:
Also usb to camera (Atik469) can not go thru DDM60 Hub, Maxim looses contact after a while if I go thru DDM60 usb hub..
Polaralignment is very good, <0.5 arcMin on both axis.
Camera and wheel are light and are connected by ASA's big focuser.
I have 34star model made with autopoint altitude 25 degrees up to 90.
I wait about 30s before each exposure to minimize flex (let system settle), up to 4minutes if meridian shift. Have too since dome is very slow.
There is some flex but the system settles very good after some minutes.
Move to object.
Find (in planetarium software) good star very closeby to focus (if not in object)
Focus manually (takes 2minutes since some little astigmatism makes it very easy to find sweet spot). Autofocus doesnt give good result
(Astigmatism, I'm waiting for comment on that from ASA, I like it cause of focusing but need to know that scope still is diffraction limited)
I dont start MLPT-run untill mount have been on same object for at least 15minutes.Usually 30minutes
then I take ONE 20min exposure.
with bad I mean about 3 arcSec drag on stars. Not visible on big stars of course but all small stars gets a very obvious elongation.
Seeing is sometimes excellent for sweden, can get below 2 arcSec. Very dark sky.
Scope sits inside a scopedome 3m (unfortunately).
Pier and dome platform/dome are not connected of course.