It looks like the hard work re-aligning and re-training the ASA mount has paid off. Here's a central crop at 100% scale from a stack of eight 25 minute unguided hydrogen alpha exposures taken during the limited hours of darkness last night:
Minimal processing at this stage and there will be a lot more detail to pull out of the nebulosity but the stars are round so the tracking of the mount is certainly a lot better than it has ever been. Here's the big picture, reduced from 4096x4096 to 1024x1024:
The subject is NGC 7822. The plan is to collect similar data using my new SII (sulphur), OIII (oxygen) and maybe even NII (nitrogen) narrowband filters as well as a set of 200 second red, green and blue exposures to get the stars in their correct colours. Then the fun starts as each of the narrowband images must have the stars removed and then processed further before combining into a false colour image to which the stars can be added back. Even if we are blessed with a run of clear moonless nights I think there may be many weeks of work to do to get to the final result.