Hi folks
returning this thread, I think perhaps the image linked
here, possibly answers the question I initially posed. Note this is a calibrated FIT (31mb), no other processing.
I am so impressed with this image given that on the night in question, the sky temp as recorded by my Cloud Sensor was 14.5 and humidity at 88%.
I have my Cloud Sensor configured to trigger a cloudy condition when the sky temp gets to 12, so at 14.5, it was not far off. Admittedly, the scope used is f3.8 but a 5nm Ha filter was also used.
cheers
Martin