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Thanks Terry
Yes, the vignetting was a function of the dew shield I used to take those shots. I've since upgraded to a light box and a RC8 which makes for a better match than the old LXD-75.
I've now experimented with Sky Flats Assistant which seems quite intuitive once you get it running. Now all I need to do is capture some lights and new flats and apply them. I tried to apply today's flats to some shots I took a month ago - urgh! not good. The old shots had already been calibrated with the dodgy flats so I ended up with a very nasty colour gradient. The right half of the screen has a delightful green hue while the centre left has a wonderful magenta look, fading to green at the extremities. I won't share those with you all - it could put you off your dinner.
Looking at the new flats, it seems they are similar to those I took but with a shorter rather than longer exposure time with ADU around 22,000 across the board.
So I'll let uyou all know how I go - probably tomorrow night
Pete
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