To get the right focus position:

-Use highly contrasted areas (limb, sunspots, plages, dark filaments, etc)
-Using longer F.L. will be easier to focus, the Maxcope and the web cam works better at an F/Number of F/15-17.5
-The Barlow lens should be positioned at around 350 mm from the ccd to get the right F/number or the 700mm FL.(that is using the Maxcope)
-The raw image should not to be to bright, it should look dim and at good balance, if you set to much "gain" or a wrong "Speed Shutter" you could over saturate some pixels after stack