Re: [APML] 2 More ST-4 questions

[Stuart Heggie <stuart.j.heggie@sympatico.ca>]

Oddly, it was clear as a bell here in Southern Ontario (but cold still, near 0C).
Our club had an imaging workshop so I went with my portable SP mount and 4"
refractor. I piggybacked my shorter lenses for some constellation shots. Took a
20min guided-by-eye shot of Jupiter in the Beehive with a 180mm ED lens (Supra 400
at f2.8) - maybe too long given how bright Jupiter is. Will see. The rest were 10
min tracked-not-guided 50mm and 24mm shots of constellations (Leo, Big Dipper,
Hercules, Scorpius).

Stuart

steve banbury wrote:

> Hi John/Alan--
>
> "John C. Mirtle" wrote:
>
> >     Ha! Got you beat - we are in the middle of a full-blown blizzard. It's
> > chest deep with snow in parts of my yard, and it is supposed to keep snowing
> > until Monday. Looks like this new moon is a wipe-out as well.
>
> We have rain here in Calif, and Alan's weather in Oregon doesn't sound any
> better.
> Isn't anybody having decent weather?!!
>
> The way I look at it-- the rate of change in temperature on the CCD must be
> greater when actively being pulled down from ambient
> by a Peltier device compared with the rate of change when passively drifting
> back up.  Still it might not be a good idea to drag the CCD into a 70 degree
> house from your snow laden back yard as soon as you're done imaging or guiding.
>
> Steve
>
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