# Services from photo-calc.x402tookit.com on Zero

> photo-calc.x402tookit.com serves 11 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/photo-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/photo-calc.x402tookit.com/health.json

## Services

- [Photography Print Size Calculator](https://www.zero.xyz/c/photography-print-size-calculator-fb031d40/llms.txt): $0.02/call via x402. Calculates print dimensions (inches and cm) from image pixel dimensions at various DPI settings, or computes required pixels/megapixels for a target print size, with viewing distance advice.
- [Photography Calculators – Time-Lapse Planner](https://www.zero.xyz/c/photography-calculators-time-lapse-planner-ea52ef7e/llms.txt): $0.02/call via x402. Calculates time-lapse parameters: given any two of interval, shooting time, and clip length, returns the third plus frame count and storage estimate.
- [Photography Crop Factor Calculator](https://www.zero.xyz/c/photography-crop-factor-calculator-ac05a331/llms.txt): $0.02/call via x402. Calculates the crop factor of a camera sensor and returns full-frame equivalent focal length, aperture, and ISO for a given lens, supporting named sensor types or custom dimensions.
- [Photography Depth of Field Calculator](https://www.zero.xyz/c/photography-depth-of-field-calculator-eb36334b/llms.txt): $0.02/call via x402. Calculates near/far focus limits, total depth of field, and hyperfocal distance from focal length, aperture, focus distance, and sensor type.
- [Photography Calculators: Exposure Value (EV) Calculator](https://www.zero.xyz/c/photography-calculators-exposure-value-ev-calculator-47ef0f48/llms.txt): $0.02/call via x402. Calculates exposure value (EV) from aperture, shutter speed, and ISO, identifies the light level it suits, and returns equivalent aperture/shutter speed pairs.
- [ND Filter Calculator](https://www.zero.xyz/c/nd-filter-calculator-11648e1f/llms.txt): $0.02/call via x402. Converts between ND factor, stops, and optical density, then computes the new shutter speed when an ND filter is applied.
- [Photography Calculators – Flash Guide Number](https://www.zero.xyz/c/photography-calculators-flash-guide-number-d4735638/llms.txt): $0.02/call via x402. Calculates flash effective range for a given aperture and ISO, or the aperture needed to correctly expose a subject at a given distance, using flash guide-number mathematics.
- [Photography Field of View Calculator](https://www.zero.xyz/c/photography-field-of-view-calculator-5bb2c7d5/llms.txt): $0.02/call via x402. Calculates horizontal, vertical, and diagonal angle of view for a given focal length and sensor size, plus the width and height of scene covered at a specified distance.
- [Photography Exposure Trade-off Calculator](https://www.zero.xyz/c/photography-exposure-trade-off-calculator-957c53a9/llms.txt): $0.02/call via x402. Given current aperture, shutter speed, and ISO plus one new setting, computes the compensating adjustments to the other two settings to maintain equivalent exposure, expressed in stops.
- [Photography Calculators – Shutter Speed Rules](https://www.zero.xyz/c/photography-calculators-shutter-speed-rules-1197905b/llms.txt): $0.02/call via x402. Returns minimum handheld shutter speed (reciprocal rule) and maximum star-trail-free exposure times (500 rule and NPF rule) for a given focal length, sensor, and optional parameters.
- [Photography Calculators – Sunny-16 Rule](https://www.zero.xyz/c/photography-calculators-sunny-16-rule-42e74f33/llms.txt): $0.02/call via x402. Returns starting aperture, shutter speed, and exposure value for a given weather condition and ISO using the Sunny-16 rule, plus equivalent exposure combinations.

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