I've been trying to figure this one out, so I figured I'd ask the experts...
I've got a Coburn thickness gauge that we used to use with I think 63mm alloy blocks. It's the kind where you set the dial to the front curve and lower a plunger to the center of the lens and the dial reads the thickness of the lens.
We're using Step One blocks (wax blocking) now. The gauge works fine for 6 base lenses (gray blocks), but there seems to be an offset of about .3mm for every diopter difference. For example, if I measure a 5 base lens and add .3 to the reading, I get the thickness called for on the job ticket (using Innovations on SGX).
Anyone else encountered this?
Blake
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