Diagonals with focuser

[LondonNeil]

I'm after a decent 1.25" diagonal, with a focuser built in,  for a cas.  The baader t2 can have a helical focuser, the William Optics can (possibly just the erecting original prism version... not sure if there is a star 1.25" would diagonal even)

Are there others to look out for?

Ta

[Don Pensack]

The choices are limited.

However, there are many helical focusers with 1.25" nosepieces that will fit a 1.25"diagonal.

The disadvantage is that you will need at least 2" of additional in focus in the back end of the scope.

This is also the disadvantage of the rear cell mounted focusers when used with a diagonal.

They, too, require a large amount of in focus.

Is there something wrong with the focuser on the scope?

[LondonNeil]

No, just a little mirror flop so the ability to tweak the focus at the diagonal is appealing.