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SAG Calculator

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Radius of Curvature (mm):

Diameter (mm):

Sag (mm): --     

Focal Length Calculator
$$ \text{SAG} = R - \sqrt{R^2 - \left( \frac{D}{2} \right)^2} $$
R Radius of Curvature
D Diameter


Determine the sag of a surface based on radius of curvature and diameter.

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