Baader M68 extension tube, length 20 mm

Baader M68 extension tube

M68 extension rings are useful if you want a solidly threaded extension and need more field than the nearly 40 mm that T2 offers.

Typical applications: Extension tubes in astrophotography (when the focus lies behind the focuser), adjustment of the sensor distance in correctors, building a projection adapter for 2" eyepieces.

Practical tip from Teleskop-Service - building a projection adapter for 2" eyepieces yourself:

The tubes fit directly onto the thread of the Baader adapter "Four in One" (not included). With this you can build for example a stable M68 extension, with the possibility to accept 2" eyepieces.

The projection adapter is attached to the telescope´s connection either via one of the threads of the "Four In One" adapter or via the 2" barrel of the eyepiece, which is extended with the TSVF230 2" extension tube.

The end of the projection adapter can again be formed by the "Four in One" adapter, connected via the reversing ring M68i-M68i. Alternatively, the ClickLock clamp BA2956269 is also possible, which can be screwed directly onto the external threads of the tubes, but only offers a 2" receptacle and no additional M68 connection.