When you are first learning the art of focusing, brighter stars are easier to work with, so you will be using very short exposure times typically a fraction of a second. A good starting value is .25 second you can increase or decrease that value to get a brightest pixel reading of around 40,000 to 50,000. The frame size to use for the exposure. Update mode Manual exposures or automatic exposures. Manual mode will take just one exposure, and then wait for you to click the a button to take the next exposure.
Automatic mode takes one exposure after the other.
Once you gain experience with focusing, you can do most of your rough focusing in automatic mode. Getting exact focus requires more time, so the last few focus efforts are likely to be manual in most situations. Exposure delay How long to wait between exposures in automatic mode. You enter the number of seconds of delay. Once you are comfortable with focusing procedures, you can use the Automatic update mode, and set an exposure delay of around 5 seconds.