PinholeCameraCalc

Calculate pinhole exposure, aperture, film settings, and long-exposure corrections in one simple darkroom-inspired tool.

Pinhole Camera Calc is a practical utility for pinhole and analog photography.

The app helps photographers calculate key exposure parameters for pinhole cameras, including optimal pinhole diameter, equivalent aperture, estimated exposure time, and long-exposure correction.

Users can enter the distance between the pinhole and the film plane, choose a film stock, adjust ISO, select lighting conditions, and receive a clear recommended exposure result.

The app includes support for classic film stocks such as Ilford HP5 Plus, Kodak Tri-X 400, Fomapan 100 Classic, and Fujichrome Velvia 50. It also applies Schwarzschild reciprocity correction for long exposures, helping users better estimate real exposure times when shooting with very small apertures.

Pinhole Camera Calc also includes a shot diary where users can save calculated settings, add notes, and review previous shooting setups later during development or comparison.

Additional reference sections explain useful pinhole photography concepts, including Rayleigh optimal diameter, equivalent f-number, Sunny 16 exposure estimation, reciprocity correction, diffraction, image inversion, and depth of field.

Key features:

• Pinhole diameter calculation
• Equivalent aperture / f-stop calculation
• Exposure time estimation
• Sunny 16 based lighting presets
• ISO adjustment
• Film stock selection
• Schwarzschild reciprocity correction
• Saved shot diary with notes
• Educational reference formulas and theory
• Light and dark appearance options

Pinhole Camera Calc is designed for photographers, film enthusiasts, students, and anyone experimenting with handmade cameras, camera obscura, analog photography, or darkroom workflows.

All saved shot entries and preferences are stored locally on the device.