Managed to get 10x16 minutes in 3nm NII of M42 and made a mosaic with the earlier Horse head data. There is a mismatch at the overlap but it gives an idea of what is possible.
Large image 5MB
http://d1355990.i49.quadrahosting.co...rsword_NII.jpg
I am finding that gradients are still a problem even with 3nm filters.
Bert