Camera_Obscura
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Description
Camera Obscura is a photographic light meter and field logbook designed specifically for black-and-white film photography.
Inspired by classic handheld exposure meters, Camera Obscura combines precise reflected-light metering with the Zone System, film management, camera-specific exposure limits, framing tools, weather information, GPS data, and a complete photographic session log.
Create a session before heading out and record the location, camera body, lens, film stock, weather conditions, exposure calibration, and intended film format. Camera Obscura supports 35 mm, 6×6, 6×7, and 6×9 photography, correctly accounting for the different angle of view produced by the same focal length on each format.
Zone System metering
The live camera view can be divided into a configurable metering grid. Tap any section to inspect and meter a specific portion of the scene.
Measure shadows, midtones, and highlights independently, assign them to the desired Zone System values, and compare their luminance range before choosing the final exposure.
Camera Obscura helps you evaluate:
Shadow placement
Highlight placement
Scene contrast
Exposure latitude
Selected target zone
Average and weighted exposure values
Expected tonal distribution
A real-time monochrome preview provides a practical interpretation of the selected exposure.
Film-oriented exposure control
Once a film stock is selected, its nominal ISO becomes the reference sensitivity.
Exposure Index adjustments are displayed clearly as a variation from the nominal film speed, for example:
ISO 100 +½ stop
ISO 400 −1 stop
ISO 3200 +2 stops
Exposure compensation is handled in half-stop increments, preserving a workflow that is natural for mechanical cameras and traditional film photography.
Tv, Av, and Program modes
Choose the exposure workflow that best matches your camera:
Tv — choose the shutter speed
Av — choose the aperture
P — automatically select a valid shutter and aperture combination
The interface uses two circular control pads inspired by traditional exposure-meter dials.
Camera-specific limits are respected automatically. When a selected camera has a maximum shutter speed of 1/500 second, unavailable values cannot be selected. Aperture values are likewise restricted according to the chosen lens.
Camera, lens, and film database
Camera Obscura includes structured catalogues for:
35 mm cameras
Medium-format cameras
Compatible lenses
Black-and-white film stocks
Nominal ISO values
Shutter-speed ranges
Aperture ranges
Supported frame formats
Film exposure counts
Custom cameras, lenses, and films can also be added manually.
Photographic logbook
When the exposure is ready, press the central control to save a photographic draft.
Each saved frame can include:
Frame number
GPS position
Date and time
Camera and lens
Film stock and Exposure Index
Shutter speed and aperture
Exposure Value
Metered zones
Scene preview
Orientation
Weather conditions
Personal notes
Sessions can contain one or more rolls, including rolls using different film stocks.
Contact sheets and PDF reports
Generate an elegant analog-inspired PDF logbook containing:
Session details
Camera and lens information
Film and Exposure Index
Weather and location
Exposure table
Zone readings
Contact-sheet previews
Frame notes and shooting data
The report is designed to accompany negatives, development notes, darkroom prints, and archival records.
Framing tools
Preview the field of view for:
35 mm
6×6
6×7
6×9
Switch between portrait and landscape framing without rotating the iPhone.
Weather and location
Camera Obscura can use the iPhone location and Apple Weather data to record:
Shooting location
GPS coordinates
Temperature
Cloud coverage
Current weather conditions
Camera Obscura is a deliberate, technical, and archival tool for understanding light before exposing film.