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Build your own DIY Spherometer


This is for calculating a How To DIY Spherometer from Gordon Waite: You Tube Video

Telescope Mirror Calculator


Spherometer Radius Ball Diameter:
Distances between the outside of each ball: A: B: C: Spherometer Radius:
Mirror Radius/Focal Length Calculation (Needs Spherometer Radius and Ball Diameter above)
Sagitta: Mirror Focal Radius: Focal Length:
Focal Ratio Calculation
(Do all Previous Calcs first) Mirror Diameter: Focal Ratio:
Focal Length Calculation
Mirror Diameter: Focal Ratio: Focal Length: Focal Length Feet: (Only if inches used)
Sagitta Calculation
(Needs Spherometer Radius above) Mirror Diameter: Focal Ratio Desired: Sagitta Needed:







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