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Yeah Steve, Ive never seen it greenish before and its really easy to over expose the centre of it with those 4 bright stars. Ive taken images with a 40D and at the time, autoguiding wasnt an option for me so I had to take short exposures, like 20secs. I didnt get any of the greenish tinge but rather started to get some deep red and grey colour. So perhaps Gary is right, you may have some serious pollution froma close light to contend with. Point is though, weather permitting, you have the scope out again and get to perhaps change a few settings on the camera and I will just bet the next one will be better ... they always are .. GOOD LUCK
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