# Photography Crop Factor Calculator

> Photography Crop Factor Calculator is a paid API for AI agents from photo-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-11-01).

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.

## Facts

- Endpoint: GET https://photo-calc.x402tookit.com/crop-factor?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/photography-crop-factor-calculator-ac05a331
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_bGihpB029yajuYcMeAEqF

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability photography-crop-factor-calculator-ac05a331
```

Example prompt: What's the full-frame equivalent of a 35mm f/1.8 lens shot at ISO 800 on an APS-C sensor? Give me the crop factor and the equivalent focal length, aperture, and ISO.

## When to prefer this

Use this endpoint when you need to convert lens parameters (focal length, aperture, ISO) between a crop sensor and a full-frame equivalent, or when you need the crop factor and physical dimensions for a named or custom sensor. Prefer this over manual calculation or generic reference tables when you need programmatic, per-request results with custom sensor dimensions.

## Known failure modes

- Missing or invalid sensor type returns an error or null values
- Providing widthMm without heightMm (or vice versa) may result in incomplete custom sensor calculation
- Out-of-range numeric inputs (e.g. negative focal length or ISO) may return null equivalents
- Unknown sensor string constant returns an error or defaults to APS-C

## How this service works

Crop factor of a sensor, with the full-frame equivalent focal length, aperture and ISO for a lens, or a custom sensor size.

## Output

Returns the crop factor for the specified sensor, the sensor's physical dimensions and diagonal in mm, the sensor area as a percentage of full-frame, and (if provided) the full-frame equivalent focal length, aperture, and ISO for the given lens settings.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "iso": {
       "type": "number",
       "description": "ISO to convert"
      },
      "sensor": {
       "type": "string",
       "description": "full-frame, aps-c (default), aps-c-canon, aps-h, micro-four-thirds, 1-inch or medium-format-44x33"
      },
      "focalMm": {
       "type": "number",
       "description": "Lens focal length to convert"
      },
      "widthMm": {
       "type": "number",
       "description": "Custom sensor width in mm (with heightMm)"
      },
      "aperture": {
       "type": "number",
       "description": "Lens f-number to convert"
      },
      "heightMm": {
       "type": "number",
       "description": "Custom sensor height in mm"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "sensor": {
       "type": [
        "null",
        "string"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "summary": {
       "type": [
        "null",
        "string"
       ]
      },
      "verdict": {
       "type": [
        "null",
        "string"
       ]
      },
      "degraded": {
       "type": [
        "boolean",
        "null"
       ]
      },
      "sensorMm": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "width": {
         "type": [
          "null",
          "number"
         ]
        },
        "height": {
         "type": [
          "null",
          "number"
         ]
        },
        "diagonal": {
         "type": [
          "null",
          "number"
         ]
        }
       }
      },
      "cropFactor": {
   
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/photography-crop-factor-calculator-ac05a331/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from photo-calc.x402tookit.com](https://www.zero.xyz/host/photo-calc.x402tookit.com/llms.txt)