[CoolhandJo (Paul)]

Thanks to all for the replies.

The issues with the image are apparent as follows:

1. Not centred. Unfortunately I knocked the scope after the Lum and couldnt get it recentred. So its cropped.
2. 1/3 of the subs were a bit out (Perriodic Error). Should of tossed em out but ran out of time so left them in. This results in an out of focus look
3. The Lum is actually too stretched. I did it on laptop and didnt realise until I viewed on my calibrated screen
4. Used Carbonies PS tools. This image should have been processed by setting the corect tonal range first, colour balanced, etc etc. When I get time I will reprocess myself.
5. My Bartinov mask was hard to view on the blue channel so it was a bit hit and miss. Resulted in blue being slightly out of focus.

Having declared all that, the DSI III PRO performed perfectly, in that it has low noise, and the larger chip hides a lot of the above issues well. It also has demonstrated, to me, that it is capable of exhibiting very high detail if used correctly.