Hi,
We have just acquired a surfacing lab, nothing too hi tech, generator is capable of cutting to -13D
I managed today to work a -16D by first working the front surface concave.
Another job is floating about needs a -20 (with some cyl) and if i order this in it will cost approx £30, is working the front to -7 optically acceptable or will it throw up problems for the Px.
What are peoples views on this? Are there limits, should it never be done, is it OK?
Regards,
Rick
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