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Look I have no problem with gettting down to a few arc seconds in aligning my NEQ6Pro now that I have version 3.35 of the controller software (which provides alignment error display and correction routines. I also run the PAE zone correction routine on objects that I am going to image. This works great for me. I also have a guider but don't use it much. However, your question about 20-30 minute subs has me thinking - why? It's not much trouble to run shorter subs and stack them and not encounter any problems. It's the cumulative signal data that is important. And for people that use a simple DSLR setup, long exposures create potential problems with the camera heating up, unreliable signal noise profiles, and possible power supply problems if relying on the camera battery and not external power.
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