Hi Sascha:
ACP and Scheduler offer two different ways to autofocus, and you can take your choice:
1) Within ACP, if you focus for each object, it will do an autofocus star search within 15 degrees of the object, but typically will be much closer. So in that case, you can set the Scheduler periodic autofocus to 0 hours (which will turn it off), and you can focus per object. That is, when you enter your Projects into Scheduler, check the "Autofocus" box.
2) Within Scheduler, you can set the periodic autofocus. I have mine set to two hours. (Scheduler, Configure menu). In that case, you want autofocus unchecked in your individual Scheduler projects. When Scheduler autofocuses, it does three things of note: 1) it focuses at high altitude, typically 70-80 degrees. 2) It focuses at T=0, and then periodically according to your setting. (T=0 when I startup, and every two hours thereafter, in my case.) 3) If the first autofocus fails, it will go back to the previous focus position, image your first object, then attempt another autofocus even if T < 2 hours.
I've tested it both ways, and I can tell you it works MUCH better for me using Scheduler's periodic autofocus rather than ACP's nearby focus. The reason is that focusing at high altitude is much more reliable. If you're shooting something at Altitude = 20, the autofocus is less reliable as you focus through the greater air mass. So I use the Scheduler periodic autofocus, and leave the autofocus boxes unchecked in my Scheduler projects.
Other people might have different strategies.
Best,
Rob
Rob Capon
(Self-appointed) "Executive Director"
Stillhouse Mountain Observatory
Charlottesville, VA
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RCOS 12.5 with SBIG STL11000M
Televue NP101is with SBIG ST8300
Paramount ME with SkyX
Techn. Innovations PD10 with Digital Domeworks
Robofocuser
ACP with MaximDL and FocusMax