Hi Paul

yes it is rather faster than I was expecting. I’ve tried this on both blue sky and cloudy sky days with similar problems. Did wonder if it was shifts in brightness due to clouds but it just seems so random, rapid and extreme. Most shots are showing similar stats but every now and then there’s these jammed up at the limit.

Currently on the initial part of the learning curve about these things but can see the impact of flats so want to try and get these right. Biases I can vaguely understand but I’m not yet at the stage where I notice much change to my images, darks just seem a pain. Given the changes from people using ccd to cmos and the comments people make I do wonder which are worth the effort though definitely flats are.

I’m going to look for a light panel, tried holding an ipad in place but it’s just to awkward as I’m using that to control things.

Regards

Nigel

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