I've been giving my ASIAir Pro a good workout recently with a Nikon D5500. I've had some issues with plate solving that I want to report.
In my experience, there are two times when the software dictates the exposure length for plate solving:
- during Polar Alignment after rotating 60 degrees
- after a GOTO for centering purposes
(A two-second exposure seems to be used and I cannot find a setting that will change this. If it exists, I apologize.)
During polar alignment, "the second plate solve" always fails. Frequently the focal length resets to "0" and/or thousands of "stars" are found. In rare cases I've been able to advance to the display which is used to adjust the mount, but no data is provided. Just a bunch of "dashes."
As a test, I mounted my 290 mini camera in the telescope and used that for PA instead of the Nikon. The image plate solved almost instantaneously.
It would seem that the plate-solving routines are optimized for sensitive astro cameras that can deliver a cleaner image in much less time than a DSLR. I think it might be very helpful to allow the user to specify the length of exposure in the two cases I have mentioned. I am glad that DSLR support was added the software and once I'm onto my target, things work well.