Telescopes which are used for photography on a professional level need to avoid any deflexure under load. This flexure is is no problem if you observe only visual, but for photography or spectroscopy any deficiencies will make your results unusable. So, you do not only need a sturdy mount with a robust connection to the telescope, but also a very good focuser – with a sturdy connection to equipment like cameras or others sensors, especially if they are used with long accessories like telecentric systems. Usually, these accessories are only attached with a simple plug-in connection. Even with good, self-centring eyepiece-holders with brass clamping ring long accessories can tilt because of the long lever. This tilt will impair professional operation. There is no better adaption than a generously sized screw coupling. The Baader M68 system solves this problem.
The M68 system includes telescope side adaptor threads for 2,7″ (Astro Physics), M68 (Zeiss), M60 (Vixen) and a female M56-thread (Synta), TEC/Feathertouch-focusers, Baader 3″ Steeltrack-Hyperion-focusers, Pentax-SD-telescopes, Takahashi, Celestron (3,3″-SC-thread), Zeiss (M68 quick changer).