FocusMax is a third-party tool that integrates with MaxIm DL to provide enhanced autofocus capabilities. It is fast and extremely accurate, and can handle ”relative mode” focusers, i.e. those that use DC motors and cannot produce fully repeatable positioning.
Connecting FocusMax can be a little confusing. It links to MaxIm DL’s camera control interface automatically. It needs to connect to an ASCOM focuser. It optionally connects to an ASCOM telescope, to provide special functions (such as automatically moving to a nearby focusing star and then returning to the original coordinates).
MaxIm DL can also connect to the focuser at the same time. Some focuser drivers can accept multiple connections. The recommended approach is to use the ASCOM Device Hub for both the focuser and telescope. Connect FocusMax and MaxIm DL directly to Device Hub, and Device Hub to the focuser and telescope.
Tip: FocusMax likes to reposition the MaxIm DL windows, which is very distracting if you are doing things other than focusing. You can turn that feature off as follows: select Set menu, Window Arrangement, Disable.
Please see http://focusmax.org for more information.