Stellafane 'Little Man' - click for Stellafane Home Page ATM Header

Sagitta to Focal Length Calculator

Did you buy a partially ground mirror at a swap meet and want to know it's focal length? Or perhaps you have been grinding your own piece of glass and want to know the current focal length. Just input the Sagitta (depth of curve) and Mirror Diameter, and this page will calculate the Focal Length, Focal Ratio and Radius of Curvature.

If you want to calculate many other telescope and mirror parameters, use our Telescope Formulas and Design Comparator page.

Parameter Value Units
Sagitta (s):
Mirror Diameter (D):

Output Written Here
Requires a browser that supports
Dynamic HTML and JavaScript,
such as
Internet Explorer 6 or Higher
Firefox 2.0 or Higher.

This message and table are replaced by results
if Dynamic HTML and JavaScript is working.
If you press the Calculate button
and nothing appears here,
your browser does not work with this page.

Back to the ATM Index Page

Page last revised on Sunday, 2009-Mar-15 11:28:54 -0400