Estenop — Pinhole calculator
The physics, solved on your phone
A pinhole camera has no lens. Just a hole. And that hole dictates everything: the light that enters, the time required, the light captured on film.
The problem is that pinhole physics leaves no room for calculation errors. An effective aperture of f/128 or f/180, combined with the reciprocity characteristics of each emulsion, produces numbers that are hard to work out in your head. Until now.
Estenop turns your phone into the light meter you needed: it reads ambient light directly from the camera, you select your aperture and film stock, and it gives you the corrected exposure time —reciprocity included— in seconds.
No charts. No calculator. No mistakes.
Try it here: estenop.vercel.app
How it works
- Point your phone camera at the scene you want to photograph
- Select your aperture (f/64, f/128, f/180…)
- Choose your film — HP5, T-Max, FP4, Pan F, Fomapan and over 20 emulsions with their real reciprocity curves
- The time appears on screen — and the built-in timer counts down until you can close the shutter
Everything stays on your device. No internet connection required. No accounts. No data leaving your phone.
Versions
Free version Includes full exposure calculation, reciprocity correction for the most popular emulsions, and the built-in timer. Enough for most situations.
Pro version — €10, one-time payment For those who want more: spot metering mode, personal camera and aperture library, exposure history, and priority access to new emulsions. No subscription. No renewals. Once, forever.
It’s handcrafted software. If it’s useful to you, Pro is the way to say so — and to make sure it keeps growing.