Originally Posted by Mallycat
Is this length of exposure (ie sub 1 second) typical for taking shots of Saturn?
Hi Mallycat, as Renormalised mentioned it is very typical for the DSI. I have imaged Jupiter at f/10 and my exposure time through the DSI was less than a 1/10 of a second, another image of Uranus was done at around 1/3 of a second.
The Hartmann mask is a very handy tool to have and will greatly assist your focussing and very easy to make, I made mine with an embroidery hoop and thick cardboard glued on. I have found that the three triangle pattern seems to work the best for me but there are many patterns to choose from.