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Andrew.
When I used (for a short time) an ST-7, I made a "library" of dark frames, at exposure times I was using (eg: 5 minutes) and temperatures I was using as well (_25 degrees or whatever).
I usually made about 10 and then averaged them into one "MasterDark". Once I had captured the image I used the dark to reduce the noise by subtracting it. Well the software subtracted it, but you get the picture.
Flats I haven't tried, but any smoot uniform surface will do. I sometimes think that the inside of the dimly lit workshop near where I observe/image would be good, it has smooth painted walls.
Gary
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