Many astrophotographers prefer a screwed adaptation because lateral clamping can tilt the corrector or flattener. This causes distorted stars in corners and makes the image look unasthetic.

The 2" UNC focusers from TS-Optics therefore have a 2,4" TeleVue thread (roughly 65mm diameter) at the end of the 2" draw tube. With this Adapter you are able to attach correctors without clamping and without losing the required precision. The clamping screws then become superfluous.

Correctors with M48x0,75 thread connection
The adapter is screwed on the corrector´s M48 thread. The female thread of the adapter is only 2mm short. This means you have easily enough space, because the connection thread of correctors tends to be 4-5mm long. Then, the corrector with the screwed-on adapter is inserted into the UNC focuser.

Baader MPCC coma corrertor
The adapter could as well be made for the MPCC. Simply remove the protection ring of the corrector to reveal the M48x0.75 thread. Then you screw the adaptor on the corrector. Now you can screw both into the UNC. The MPCC´s T2 thread can be used for the rest of your adaptation.

Corrector and flattener with T2 thread
Correctors with the smaller M42x0,75 connection thread can also be screwed onto UNC focusers. Insert the corrector into the draw tube. Then pull on the TS65-M48i adaptor which fixates the corrector. The adaptor now has the function of a retaining ring.