<https://stargazerslounge.com/topic/82057-low-profile-focuser/#comment-800473>
<http://schema.org/text>
"Newt's terminology about vignetting is very confusing. If I were you I'd just use Mel Bartels's diagonal calculator. I'd give it s spin (assuming a 14\" tube, 2.25\" secondary and 5\"+1\" from the tube to the focal plane unless you'd tell me otherwise), but I don't know the f/ratio of your scope. \n"
<https://stargazerslounge.com/topic/82057-low-profile-focuser/>