Optics performance
Exit pupil, twilight factor and relative brightness for binoculars or a spotting scope.
Exit pupil, twilight factor and relative brightness are optical-comparison indices for reading a spec sheet, not photometric measurements of light delivered to the eye.
e.g. 8 for 8x binoculars.
e.g. 42 for a 42mm objective lens.
Enter magnification and objective lens diameter.
What it needs
- Magnification, required — e.g. 8 for 8x binoculars.
- Objective lens diameter (mm), required — e.g. 42 for a 42mm objective lens.
In AdventureOS
Part of Wildlife.