Jones diagram

English thumb|400px|Two-quadrant analogue of a Jones diagram showing the relationship between a camera's focal length, crop factor and angle of view for two aspect ratios via its effective focal length Etymology Developed by Loyd A. Jones in the 1940s. Noun A type of Cartesian graph where each axis represents a different variable, and opposite directions along an axis represent different quantities rather than positive or negative signs of the same quantity; thus four variables are diagrammed in total. en eponyms