Secondary Mirror Offset Calculator
Primary Mirror Diameter:
Telescope Focal Length:
Secondary Minor Axis:
Centre Dot Offset:
In the first four boxes, please enter the diameter of your telescope's Primary Mirror, and also the minor axis diameter of your telescope's Secondary Mirror. Click "Calculate Offset" to show a summary in the second box, and a full analysis in this box. This Analyser, including all calculations and formulae contained within, is Copyrighted in full to Lachlan MacDonald (© 2007, Lachlan MacDonald). No part of this document may be used elsewhere than at this location, without prior express written authorisation from the author.