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Thanks everyone for the comments!!
I was suprised at how much of the fainter extremities came up with under a hour total exposure. still a touch of noise there..but quiet happy with the image..it was over 20 degrees last night and humid as well.
Garyb..I found that one of my locking bolts to lock collimation on the mirror cell was not actually touching the rear plate behind the mirror. Just a tiny gap enough to allow some sag I guess?, so I tightened up the cell by pulling back the mirror on the springs to remove the gap and all 3 locking bolts now hit up nicely on the plate...
I hope this was the problem? some more longer exposures will tell...fingers crossed ;-)
Cheers everyone
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