The camera's optics, as an instrument rather than as a projection matrix.
Every field is something a photographer sets. Nothing here is derived, and nothing here depends on the window: a lens taken through a resize is the same lens, which is the property the terrain selection and the framing solver both stand on.
lens.ts:97Members
focalLengthreadonly
Focal length, millimeters, before zoom.
focusreadonly
Focus distance, meters. Infinity is a lens racked to the stop.
fStopreadonly
f-number: focal length over aperture diameter.
gaugereadonly
Vertical extent of the sensor, millimeters.
isoreadonly
Sensor gain, ISO.
shutterreadonly
Shutter time, seconds.
zoomreadonly
Multiplier on the focal length. 1 is the lens's own.
Zoom is not the dolly and it is not framing — it magnifies without moving the camera, so it changes no parallax and no occlusion. The planetarium gives each of the three acts its own control, because one control cannot describe all three without saying something false about two of them.