Deco-Lux Exposure

our phone is now the most capable light meter you own. Deco-Lux Exposure is a professional-grade spot and incident light meter built for photographers who shoot film. Whether you're metering a single shadow with a Leica rangefinder or mapping nine zones across a 4x5 landscape, this is the tool that replaces a $700 handheld meter — and does things no handheld meter can. PRECISION METERING • Spot metering via rear camera with hybrid AE analysis for accurate EV readings in any condition • Average and center-weighted metering modes for quick overall scene evaluation • Incident metering via ambient light sensor — no accessory dome required • Adjustable calibration (±3.0 EV in 0.1-stop increments) to match your trusted reference meter • EV smoothing for stable, readable values without jitter ZONE SYSTEM — BUILT IN, NOT BOLTED ON • Full Zone 0–X visualization with true grayscale rendering • Store up to 9 readings as midtone, shadow, or highlight • Subject Brightness Range (SBR) calculated automatically • Drag-to-place zone shifting — slide the entire tonal map to expose for the zone you want • Pre-visualization strip shows how your readings will actually render on film • N+/N- development suggestions based on SBR and film characteristics • Dynamic range clipping warnings when your scene exceeds your film or camera FILM STOCK INTELLIGENCE • 30+ built-in film profiles: Tri-X, HP5+, Portra, Ektar, Velvia, and more • Automatic reciprocity failure correction — no more guessing at long exposures • Exposure latitude indicators for over and under exposure • Push/pull limits per stock EXPOSURE PRIORITY MODES • Program (P): Best-match aperture and shutter from your camera's actual settings • Aperture Priority (Av): Lock your f-stop, get the shutter speed • Shutter Priority (Tv): Lock your shutter, get the aperture • Tap any exposure combo to see every valid aperture/shutter combination for the scene CAMERA PROFILES • Define your camera's exact aperture and shutter speed clicks • Set dynamic range per body — the app works within your camera's real capabilities • 7 presets included: Leica M6, Hasselblad 500 C/M, Nikon F3, and more • Create unlimited custom profiles SESSION LOGGING • Automatic session tracking with every metering sequence • GPS tagging with reverse geocoding — know exactly where you made each exposure • Review past sessions with full zone bar reconstruction • Editable notes per session • Shareable exposure cards — art deco styled 1080×1920 PNG summaries of your metering data PHOTOGRAPHY TOOLS • Pinhole Calculator — with film-specific reciprocity correction • Filter Stack Calculator — ND, polarizer, and B&W contrast filters with 23 presets • Bellows Extension Calculator — macro and large format compensation • Depth of Field Calculator — near/far limits, hyperfocal distance, visual depth bar • Fill Flash Calculator — guide numbers, ratios, sync speed constraints • Long Exposure Timer — countdown with alarm, vibration, and screen wake lock • EV Reference Table — real-world scene descriptions from EV -6 to EV 18 DESIGNED FOR THE DARKROOM, NOT THE FEED • Dark theme with gold and deep purple accents — inspired by art deco instrument design • Luminance histogram with zone-coded clipping warnings • Multi-spot map overlay showing all stored readings on the viewfinder • Voice readout for hands-free operation in the field • Home screen widget for instant EV/exposure at a glance • Pinch-to-zoom for precise spot targeting • AE lock for comparing scene brightness with a frozen reference • Full landscape support — no state loss on rotation No ads. No subscriptions. No cloud account. Your data stays on your device. Made by a photographer, for photographers.