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Jeff,
I suppose the moral to the story about focusing is “Don’t focus in your target area as the stars are usually to small and dim” ( with some exceptions like M42 and the Horsehead with Alnitak )
Focus on a brighter single Star around mag 2.0 to 2.50 ( not double star or variable star or pulsating star ) in the vicinity of your intended imaging target , so you get a good visual on the 15sec exposures in APT thumbnails and adjust your focusing accordingly exposure after exposure until your focus is tight
It hasn’t failed me in 7 months using the 2600MC with all those filters or unfiltered
Remember to set your camera to Highest Dynamic Range (Gain 0 )
Cheers
Martin
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