Eric wrote:
I'm looking at the adds for the DSI Pro. I have also looked at the adds
for the original DSI (colour). The maximum exposure time for either
camera is supposed to be 1 hour. Has anybody ever tried this ? I ask
because the sample images are all stacked up 30s exposures. I haven't
seen any individual exposure longer than 30s. Also, anybody know what
the well depth and read noise are ?

Thanks.

Eric.

One reason for the short times is simple. "tracking error"
At 30s you can get by with just about anything with a motor.
At 1 hour you need a very very expensive mount and drive and
guider CCD and guide scope.. All of which will come to about $10,000.
That seems like a lot of up-front expense for a $300 camera.
You may as well pitch in another $6000-8000 and get a better/bigger CCD
camera and another $1500 for the software to process the images.
Oh, I forgot about the $5000-15000 for the telescope.

Well, you can get by with a lot less, but not for 1 hour exposures.

Steve