I'm building a 12.5" dob, and I will need to cut my poles to length soon. Where do I want the focal point to hit in relation to the top of the focuser tube (i.e., the rim on which the eyepieces rest)? Thanks in advance.
Focal Point
Started by stuper1, 06/08/2006 04:37PM
Posted 06/08/2006 04:37PM
Opening Post
Posted 06/10/2006 04:04PM
#1
Stuart,
I recently got some advice that the FP should be a hair over half of the travel distance of the focuser tube. My focuser tube will extend 2 inches, so I'm declaring my FP to be 1.25 inches above the top of the focuser tube when all the way in/down.
If there is a better answer, I'd like to hear it too.
..........David
I recently got some advice that the FP should be a hair over half of the travel distance of the focuser tube. My focuser tube will extend 2 inches, so I'm declaring my FP to be 1.25 inches above the top of the focuser tube when all the way in/down.
If there is a better answer, I'd like to hear it too.
..........David
Funding Member
