# Saylor Innovations Lens Field of View Calculator

> Saylor Innovations Lens Field of View Calculator is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Calculates horizontal, vertical, and diagonal field of view angles, equivalent focal length, and scene coverage dimensions for a given camera sensor, focal length, distance, and orientation.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/photo/field-of-view?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-lens-field-of-view-calculator-e825c4e4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WaM6l_PQfCzJEmUjNxRjZ

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 saylor-innovations-lens-field-of-view-calculator-e825c4e4
```

Example prompt: What's the field of view for a 35mm lens on an APS-C Nikon/Sony sensor in portrait orientation, and how wide a scene will it cover at 8 meters?

## When to prefer this

Choose this endpoint when you need precise optical geometry calculations for a specific camera sensor and focal length combination, especially when comparing across sensor formats or computing exact scene coverage at a known distance. It is preferable over generic photography advice when you need numeric FOV angles or coverage dimensions for planning a shoot, selecting a lens, or verifying framing.

## Known failure modes

- Invalid or unrecognized sensor type returns an error or defaults to full frame
- Non-numeric focal_mm or distance_m values cause a 400 bad request
- Missing required computation inputs may return null or incomplete fields
- Very extreme focal lengths (e.g. 0mm or negative) likely produce invalid results
- API payment failure (402) if x402 payment is not provided or insufficient

## How this service works

Horizontal/vertical/diagonal FOV, equivalent focal length, coverage at distance and focal length to frame a subject

## Output

Returns horizontal, vertical, and diagonal FOV angles in degrees; the 35mm equivalent focal length; scene coverage width and height at the specified distance; and optionally the equivalent aperture if f-number is provided. All values are computed based on sensor crop factor and standard lens geometry formulas.

## 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",
      "POST",
      "PUT",
      "PATCH",
      "DELETE",
      "HEAD"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "sensor": {
       "type": "string",
       "description": "optional full_frame, aps_c_nikon_sony, aps_c_canon, micro_four_thirds, one_inch, medium_format_44x33, medium_format_645, super35, phone_1_over_1_3; default full_frame (query)"
      },
      "f_number": {
       "type": "string",
       "description": "optional, to compute equivalent aperture (query)"
      },
      "focal_mm": {
       "type": "string",
       "description": "optional focal length in mm (query)"
      },
      "distance_m": {
       "type": "string",
       "description": "optional subject distance in meters (query)"
      },
      "orientation": {
       "type": "string",
       "description": "optional landscape (default) or portrait (query)"
      },
      "subject_width_m": {
       "type": "string",
       "description": "optional width of the subject or scene to frame (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object"
    },
    "description": {
     "type": "string"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-lens-field-of-view-calculator-e825c4e4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)