anyone still using Sony f707 astrophotography and related questions

Hi, I have one and it's probably my first step into getting into
astrophotography. I've ordered an adapter, hope it comes soon.

Questions, setting timer or use external timer, I have to locate that
old manual, but I was wonder what folks found successful for extended
exposures.

- Did you store images as tiff or jpg

I have a 8" dob and recently purchase a nightrider. I working on the
settings on the night rider yet. But some technical questions have
come up and I was wondering which web site might help me calculate the
effect on each parameter. Here goes the questions

- I beleive that I would like to learn the relationship between earth
rotation, scope parameters and CCD pixel parameters so that I may learn
to estimate the optimal maximum exposure. which web site might cover
that. It will be interesting to learn this and maybe I'll be able to
teach my daughter's science class how these relate.

- have a mac and pc. The mac is a laptop and if I can find software
for processing the pictures on the mac it would be great.

.