On behalf of ilan1204 do any of you know the formulas required to determine thickness anywhere on a lens?
As I told him in a pm the last time I did it was 33 years ago in school and I have forgotten how.:o
I do remember needing 2 or 3 points of thickness to start and then going from there. I don't think we ever had a frame involved however.
[edit- OK the smokes out of the room for now so I suppose you just need to add the "decentration in" to the formula to get the thickness assuming a minus lens.]
I'll be reading your responses until the room fills with too much smoke from my head.:)
Thanks
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