In a very small nutshell, how can a pointing model improve tracking?
Why would you need such a model on a scope with encoders?
How much improvement can you expect in unguided imaging with a mount without encoders?
I have a 900 mount and take lots of unguided images for photometry - over a hundred thousand todate. A big factor in the quality of my data is tracking-related, costing me a lot of time filtering out the worst. I am in line for a Mach2 but who knows when that will become reality. I have been hesitant to buy the APPC given that it comes with the Mach2. Hate to pay for the same thing twice. :-) But, if it really works..... -- James (Bruce) McMath
