Derivation of Riflescope Parallax Equation Workbook
Click the link below to open/download an Excel (xlsx) workbook that allows you to enter your scope’s values and visually observe on a graph the amount of parallax errors which might be incurred. The workbook and calculations are derived from the article/post: “Derivation of Riflescope Parallax Equation” by Michael G. Tappy, December 30, 2008 (Revision 1: 14 Jan. 2009). The article is posted at the forum on rimfirecentral.com.
Link to open/download the workbook: Derivation of Riflescope Parallax Equation.xlsx
Note: The workbook does assume you have either read the article or have a basic understanding of parallax errors.