HELP!
What is the formula to calculate Black Size needed for a lens. Taking into consideration decentration..... I need it right away . . . .
Thanks.......
HELP!
What is the formula to calculate Black Size needed for a lens. Taking into consideration decentration..... I need it right away . . . .
Thanks.......
Effective Diameter + 2(Decentration) = MBS
Yup, that's how I do it.
Now that, hopefully, your immediate crisis has passed, I might suggest that every lab have a copy of "Optical Formulas Tutorial" by Stoner and Perkins. It's used extensively in the college-based Opticianry programs and a god-send for those of us who learned these things many years ago and sometimes forget. You can find it at the NAO website, www.nao.org.
I have to agree with Judy. That book was not available when I went to school but I certainly wish it was. It is a most excellent compilation of the most useful formuals we run across. Plus it is very clear and easy to use and understand.
I used this text when studying for the ABOM exam a number of years ago and it did wonders. I can't recommend it enough.
-Brendan
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