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Photography Calculators – Sunny-16 Rule
x402
Photography Calculators – Sunny-16 Rule is a paid API for AI agents from photo-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Returns starting aperture, shutter speed, and exposure value for a given weather condition and ISO using the Sunny-16 rule, plus equivalent exposure combinations.
Price / call$0.02
Success—
StatusUnknown
How this service works
The sunny-16 rule: starting aperture and shutter speed for sun, cloud or shade at your ISO, with the exposure value it implies.
Output
Returns the recommended aperture (f-number), shutter speed (as a fraction string and decimal seconds), ISO used, EV100 value, a plain-English summary of the lighting level, a list of equivalent exposure combinations (different aperture/shutter pairs at the same EV), weather condition echoed back, and a disclaimer about the rule being a starting point.
Example use cases
Film shooter dialing in exposure
“I'm shooting a roll of ISO 200 film in open shade today — what aperture and shutter speed does the sunny-16 rule recommend, and what equivalent combinations can I use?”
Bright beach or snow shoot
“I'm about to shoot on the beach in full sun with my camera set to ISO 100. Give me the sunny-16 starting exposure and the EV it corresponds to.”
Overcast street photography setup
“It's heavily overcast outside and I'm shooting at ISO 800 — what does sunny-16 say my starting shutter speed and aperture should be?”
Technical details
Endpoint
GEThttps://photo-calc.x402tookit.com/sunny-16?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, rule-based starting exposure for outdoor natural-light photography without a light meter, especially for film photographers or anyone unfamiliar with metering. It is ideal for coaching users on the sunny-16 rule rather than computing a precise light measurement.
Side effects
- Missing required 'weather' query parameter returns an error
- Invalid weather enum value (e.g. 'foggy') causes a validation error
- Very high or unusual ISO values may yield unexpected results
- Network timeout or upstream service unavailability
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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