Modern autoguider like the Lacerta M-Gen are very efficient and offer a high resolution. For telescopes up to 8" aperture, even a 50 mm finder is sufficient for clean guiding with an autoguider. Thus, you save a heavy guide scope or the complex adaption with an off-axis guider.

Easy and screwed adaption:

Simply remove the eyepiece from the finder (by unscrewing) and insert the parfocal adapter. Then, you can dirctly screw in the M-Gen autoguider and get started. Your 9x50 finder turns into a compact guide scope.

Focusing is done via the knurled ring at the lens of the finder.