Hi Gary,
Certainly a deep image, maybe you could have tried ISO of 400 instesd of 800, there seems quite a bit of noise in the image.
I have tried some images of M 42 with a 135mm F/ 2.0 Lens and found that the maximium time at 800 was about 1minute 30seconds, however i got much better results at a lower ISO setting.
I realise you were imaging at 3.5, but i think you may have overdone the times, and ISO setting.
However you certainly have brought out a lot of detail, nice work
Cheers leon
