Thanks all for the comments. It is difficult to be objective about any image you produce yourself especially when you have been up all night. I have taken the comments on board and produced this new improved image. I am not really happy wth the raw data because of the clouds interference.
Jase the 100ED is fitted with an Astro Physics 2.7 inch focuser and an AP 0.75 FR/FF so it is actually f/6.75 at 675mm FL. I have optimised the FR/FF to sensor distance to get the flattest field and this turns out to be at a focal reduction of 0.75. So the FOV is 2.59x3.14 degrees approximately.
You are correct Scott it is tricky getting everything to show in widefields due to the huge variation in dynamic range. This HDR method seems to work quite well. I am still trying to improve it.
Large full resolution image 4.2MB
http://members.optusnet.com.au/~trlee8/lagtr_100mos.jpg
Melboune weather has been almost continuously cloudy lately. Good for some rain at least.
Bert