William Flattener Mk. V for f/5 to f/7 refractors (does not effect the focal length)
... especially designed for DSLR cameras

Connecting the DSLR camera:
The optimal distance from the flattener's T2 thread to the focal plane is 55 mm. So you only need the correct T2 ring for your camera.

Connection to the telescope:
On the telescope side, the flattener has a 2" nosepiece. It can be screwed off and leaves a female M48 thread.

Technical details:
-- Telescope side: 2" nosepiece and M48 x 0.75 thread (2" filter thread)
-- Camera side: T2 (M42 x 0.75)
-- Optimal back focus: 55 mm from the T2 thread
-- Mechanical length: 50 mm (without 2" nosepiece and T2 thread)
-- Fully multi-coated