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thanks for the replies. I myself have a v.w. and along the way many u.s. made cars. I have both sets of standard and metric tools. Believe me, it's a hassle somtimes. I'm glad there's not a third...

any mathmaticians in the house. Can anyone explain where a decimal goes after you do the math? for example What is the focal lenght of an -9.00 D lens in cm? I get .11111111 now would it be 1.11...

thank you for the info Pete. I tried to comprehend the vertex stuff in the other post but...I'm not there yet. thanks again. ed

I'm just starting in this field and the info at work is nil or not enough. One ? is through what meridian will light pass undeviated with this rx t 2.50 -2.50 x150 is it 60? another concerns...