Baader T-Ring Canon EOS UltraShort to T-2

Baader Ultra-short T-Ring 

Baader Ultra-short T-Ring to connect Canon EOS cameras on the Astro T-2 system
Ultra-short T-ring with an optical path length of 2mm
The last hope for achieving the focus when nothing else helps. The optical length of this ultra-short T-ring is 2mm - compared with the usual 11mm You won 9mm Backfocus.
Telescope side: T-2 internal thread with 0.75mm pitch