Optaxis / Tools Articles

During the shoot · Framing & metering

Focal

Equivalent focal length conversion, depth-of-field calculation and a macro mode — work out equivalent angle of view and DOF across formats.

When you would reach for it

At a glance

Where to find itTools tab → Focal
CategoryDuring the shoot · Framing & metering
PriceFree — every tool is open at this stage, with no paywall
Other languages焦距 · Focal · 焦距 · 焦点距離
PlatformsiOS 17.0+ / Android

Related tools

Compose
Live composition guides overlaid on the viewfinder — rule of…
Tilt/Swing
A Scheimpflug calculator: enter the focal length to get the …
Exposure
An exposure calculator: ND filter stops × shutter speed conv…
Live Shift
Live shift simulation: preview pure rise / fall and lateral …
Timer
Long exposure and interval countdown timer…
Session
A unified exposure workflow: reciprocity, bellows factor…
Compass
A bearing compass (azimuth) for working out which way you ar…
Color Meter
Measure ambient colour temperature (K) and green–magenta tin…
Film View
Film viewfinder: see live what this scene would look like on…

Focal is one of 36 photography tools in Optaxis — in the same app as the community and the gear library.

Get Optaxis on the App Store