Waited till 4AM for cloud to clear since IR satellite map looked promising. Moon (70%) was a scorpions length away.
Used my new secret weapon an extension to the lens shade made out of a 500g coffee tin painted matte black. This limits the amount of sky the lens 'sees' to about nine degrees instead of about twenty. The sensor diagonal is 8.4 degrees.
This minimises light not contributing to the image getting into the lens. This unwanted light lowers contrast and raises recorded sky glow.
Details
Canon 5DH, Canon 300mm F2.8 at f/3.5. Astronomik 13nm HA filter.
Exposures 20 x 240s at 1600 ISO, fridge at -5.0C.
There are a couple of other nebs in the field of 7.0x4.6 degrees.
Medium image here 4MB
http://d1355990.i49.quadrahosting.co..._03/bugneb.jpg
Since the coffee tin worked so well I will go and have a beer now. Bert