Support

Sunny 16 - Film Exposure Calculator

Contact Us

Have a question, found a bug, or want to request a feature?

r4k.industries@gmail.com

Frequently Asked Questions

How do I restore my purchase?

Go to any locked feature and tap "Restore Purchase". Make sure you're signed in with the same Apple ID you used to purchase.

Does the purchase work on both iPhone and Apple Watch?

Yes! One purchase unlocks Full Access on all your devices.

How accurate is the light meter?

The light meter uses your iPhone's camera to estimate EV. It's great for getting in the ballpark, but for critical work, consider a dedicated meter.

What is the Sunny 16 rule?

On a sunny day, set your aperture to f/16 and your shutter speed to the reciprocal of your ISO. For example: ISO 400, f/16, 1/500s.

Why can't I access indoor/night conditions?

Indoor, night, and moonlight conditions are part of Full Access. Tap any locked condition to see upgrade options.