[Paul Haese]

Originally Posted by John K

Thanks Paul - good info.

For a 12" I might need this approach:

https://www.youtube.com/watch?v=Ge1zG8-Y1kA

John K.

John, I would not buy the tubed version, the truss version is better and holds focus for a lot longer. I found that the tube version was a pain in holding focus, whereas once cooled the truss version gives about 2 hours before needing a refocus.