[stringscope (Ian)]

I am in the process of rebuilding my 20" dob. Unfortunately, I am currently without access to a PC running windows, all Mac at home at present and not allowed to load unapproved apps onto my work laptop. I need to design a mirror cell for my 20" F5 mirror and without windows, cannot use PLOP.

Is there anyone out there who could run PLOP for me for the following:

Mirror diameter - 508mm
Mirror thickness - 51mm
F Ratio - F5
Substrate - Pyrex
Central obstruction - 89mm
18 point cell

Many thanks,