Re: Observing on the move


Stephen Paul wrote:
....
>
> I know little of photometry,

And it shows.

>but if stars and portability were primary
> concerns, then I'd be thinking 4" F9 ED doublet ($$), or 4" F6 apo triplet
> ($$$$) refractor. These have comparatively zero cooldown time, and are
> pretty much dew proof for hours and hours.

Aperture photometry is all but impervious to cool down issues but the
heck of sensitive to aperture, which is vastly much larger for a 8"
SCT. As for refractor being dew proof for hours to no end; just don't
be ridiculous.

Andrea T.

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