After months of cloud finally a clear night without an interfering Moon.
Details
Canon 5DH, Canon 300mm F2.8L, at f/3.6 with exterior aperture.
Hutech LPR filter.
Exposures 20X( 30s, 60s, 120s, 240s) at 1600ISO, fridge at -10C.
The usual HDR method
Large image 5.5MB
http://d1355990.i49.quadrahosting.co...0_12/seagn.jpg
I have made some modifications to the optic train with a noticeable improvement.
The image has only been very slightly cropped from the full frame notice how the corners and edges are quite good for colour and signal to noise.
I used to get a colour cast due to vignetting and incident angle of light on rear LPR filter. I have mounted an 82mm LPR filter in front of the lens this also acts as an aperture.
Bert