Stops: Pocket Assistant
The lens cannot stop down. The filter has to.
A light meter and ND filter calculator for the DJI Osmo Pocket 4P, which has a fixed aperture and so leaves neutral density as the only way to hold a 180 degree shutter in daylight.
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Why We Built It
The Pocket 4P shoots at f/2.0 on the wide and f/1.8 on the tele, and neither can be closed. In anything brighter than an overcast afternoon that means the shutter has to give, and a shutter faster than 180 degrees is what makes video look like news footage rather than film. Stops reads the light through the iPhone's camera, works out how many stops of density the scene actually needs, and names the filter in your bag that gets you there, with the ISO that covers whatever it overshoots by.
Key Features
- Reads the scene through the iPhone camera and converts it to an exposure value, then names the filter and the ISO
- Recommends only from the filters you have ticked as owned, and says so plainly when nothing you own is dense enough
- Offers the plain ND alongside any polarising pick, because a polariser changes the picture and not just the exposure
- Estimates the light for where you are standing from the sun's elevation and the cloud overhead, for planning a shot before you reach it
- Field notes for the settings worth fixing once per location, with the section about where you are written on device using Apple Intelligence
- A calibration trim to square the iPhone's meter against the Pocket, set once and left alone
App Specifications & Privacy
Developer: Indy.inc (Indy Bains)
Platform: iPhone (iOS 26.0+)
Pricing: Free, with no adverts, no subscription and no account
Privacy: 100% on-device processing. Zero data tracking.