I have an LX90 and I am considering buying a crayford microfocusser for it so that I have better control over fine focus.

My question is - has anybody had any experience of these (i.e. the type that screw directly onto the rear cell of the LX90).

http://www.williamoptics.com/wo_shop...ge.php?pID=228

Do they interfere in any way with the telescopes movement in alt-az mode when used in conjunction witha diagonal.

Thanks