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Thank Ryan,
I have learnt a few things today.
1. White LCD screen ok.
2. Choose an exposure so not to saturate. After further tests today, exposure at 0.5 sec and 1/3 sec are giving results within the expected Mean / Max boundaries for my setup. 1/4 sec is too low.
0.5 Sec Exposure. Mean: 6245, Min: 2488, Max: 9652
1/3 Sec Exposure. Mean: 4860, Min 2004, Max: 8660
3. Take Flats at same ISO. I have settled on 1000 ISO for my photos. I have used the same ISO setting for Lights, Darks, BIAS and Flats.
4. Use same focus. I haven't done this. Good lesson learnt. I'll apply this rule going forward.
5. Allow the camera to decide the exposure length. I haven't done this either, instead tethering my Sony A7 to my laptop, setting the camera to manual and choosing the shutter speed from the Sony Camera control software. I'll also explore this option going forward.
My setup and 1/3 exposure results attached.
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