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Push Film Exposure Reference Cards + Calibration Service

A laminated, pocket-sized exposure reference card set (one per film stock) that maps push levels (1, 2, 3 stops) to specific metering adjustments, flash ratios, and development times. Photographers mail in a test roll shot at their camera/meter combination; we process it, measure actual exposure variance, and send back a personalized calibration card with their specific meter's correction factors printed on it.

PHYSICAL_PRODUCT

22 weeks • 70% confidence

Value Proposition

Eliminates guesswork by providing film-stock-specific, meter-calibrated exposure data in a format that fits in a camera bag. Personalization means their specific meter's quirks are accounted for. Faster and cheaper than buying a $400+ spot meter or learning complex zone system math.

Target Audience

Film photographers aged 25-55 who shoot pushed film regularly (35mm and 120 format), own light meters, and shoot 4+ rolls per month; includes both hobbyists and working professionals (wedding, editorial, commercial shooters).

Key Features

Pre-printed cards for 20+ common pushed stocks (Portra 400→800/1600, HP5→1600, Tri-X→1600, Fuji Pro 400H, etc.)
Personalized calibration service: photographer shoots test roll at 5 push levels, we densitometer-measure negatives, print correction factors on their card
Laminated, weather-resistant cards with metering adjustments, flash sync speeds, and recommended dev times per push level
And more, with full implementation detail...

Tech Stack

Densitometer (partnership or lease, not ownership) Variable data printing vendor (Printful, Automated Printing, or local print shop) Shopify for e-commerce Stripe for payments

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Original Problem

Film photographers struggle to accurately expose pushed film without reliable metering guidance

Film photographers who push film (shoot at higher ISO than rated) lack clear, standardized methods for metering exposure, leading to inconsistent results and wasted film. Current solutions rely on trial-and-error, outdated charts, or expensive light meters that don't account for pushing variables. This creates frustration for both hobbyists and professionals who need predictable outcomes.

Score: 56.5%

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