I've finally processed it.
... and here it is warts and all.
This was captured with the ST8i, CFW8A and Olympus Zuiko 100mm f/2.8 lens at f/2.8 (
I can't remember now... maybe I stopped it down one stop?). This was captured at -10°C with the Custom Scientific clear filter, so there is no IR blocking, dark frame subtracted and no flat - single 10 minute exposure.
Focus was fiddly to say the least, even with a Bahtinov mask/racquet. I couldn't get clear diffraction spikes on screen, but I could get the distorted star shapes symmetrical as I adjusted focus, and I checked using the CCDOps focus tool. I'm not sure how much of the focus problem is IR and how much is just ordinary focusing on my part...
.
It is certainly different working with 16 bits, and not particularly easy with a lens and clear filter combo
. I'm tempted to take the lens off for a while and practice with the ED80 where I can at least attempt to find or set up a parfocal EP to aid focusing
. I might have to take the plunge and buy a new CS L filter so I get some IR blocking too...
Al.