Hi,
Talking of extension tubes. I need one for collimating my Maksutov.
Anyone know where I can get one about 150 mm long?
To do a very accurate collimation on the Mak, one does not use a diagonal to start with. The focus is very limited so I need an extension tube. It must be able to hold a eyepiece at one end only.
Must be very well made! Mick Pinner!!