Hey Albert
That's the best collection of ASA images out side Wolfgang Prompers stunning assembly, well done mate
Given the faster F2.75 range of ASA astrographs was only designed to correct an image circle to cover a bit more than the 18mm diagonal of the Kodak 3200 chip (ST10), your images show it is quite good even for DSLR APM size chips (33mm diagonal).
The variation in star image shape across your shots seem to suggest that much of the star elongations noticable at the edges may just be from collimation error?
All very nice shots, well done!
Mike