FocalLengthKind

class ctapipe.instrument.optics.FocalLengthKind(value)

Bases: Enum

Enumeration for the different kinds of focal lengths.

Attributes Summary

EFFECTIVE	Effective focal length computed from ray tracing a point source and calculating the off-axis center of mass of the light distribution.
EQUIVALENT	Equivalent focal length is the nominal focal length of the main reflector for single mirror telescopes and the thin-lens equivalent for dual mirror telescopes.

Attributes Documentation

EFFECTIVE = 1

Effective focal length computed from ray tracing a point source and calculating the off-axis center of mass of the light distribution. This focal length should be used in coordinate transforms between camera frame and telescope frame to correct for the mean effect of coma aberration.

EQUIVALENT = 2

Equivalent focal length is the nominal focal length of the main reflector for single mirror telescopes and the thin-lens equivalent for dual mirror telescopes.