Originally Posted by
Fezz
I agree with Robert...
I believe a lot of this type of situation is caused by lens flexture. Which also raises the point of power changes due to this problem. I have found that polycarbonate tends to be the worst. To remedy, I often order surfaced as Robert mentioned or ordered stock with thicker centers (1.5 or 2.0 poly instead of 1.0). This may defeat the purpose of some thinner lenses, designs, but a Zyl frame hides so much of the thickness already.
I believe that AWTECH is correct in his explanation of edger design, bevel issues, and limitations to be true.
Fezz
:cheers:
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