Exposure Triangle Equivalence Solver
Solve for the setting that keeps the same exposure when you change one.
About this tool
An exposure-triangle equivalence solver for photographers learning manual mode. Enter a base exposure (ISO, aperture, shutter) and change one setting; it computes the scene's exposure value and solves for the remaining setting that keeps the exposure identical. It also lists several equivalent ISO/aperture/shutter combinations at the same EV.
Frequently asked questions
How do I keep the same exposure when I change aperture?
Enter your base ISO, aperture and shutter, then add new_aperture=. The solver returns the shutter speed that holds the exposure value constant, plus the scene EV.
What is exposure value (EV)?
EV is a single number for a brightness/exposure combination: EV = log2(aperture² / shutter) referenced to ISO 100. Equal EV means equal exposure regardless of which settings you use.
Can I solve for ISO or shutter instead?
Yes. Provide exactly one of new_aperture, new_shutter or new_iso and the tool solves for the matching remaining setting.
Does changing ISO change the scene EV?
ISO doesn't change scene brightness, but raising ISO lets you use a faster shutter or smaller aperture for the same image lightness. The tool accounts for ISO when solving.