The problem is not the determining the prescription, the problem it is the cost of a small run.
There is a chap working on the entire optical chain of the all the No. 32 scopes for me right now and believe me he knows his caca in optics.
He has designed optics for NASA and the US navy. He was on here briefly but someone really pi***d him off and he just disappeared.
I touched base with him and we have keep in touch over the years.
Anyhow, the all lens prescriptions are currently being done and some lenses are out for quote right now.
However, glass lenses are not cheap in small quantities.
After the episode with the Aussie Pattern 18 ocular lenses I will not be the one ordering them and putting the money up front.
Perhaps if someone knows of a glass lens maker with the lens grinding bowl and willing to do a small run, PM me and we can try plan B.