Astronomy
Telescope Field of View Calculator
Compute telescope optics for visual astronomy: magnification, true field of view, focal ratio, exit pupil, limiting magnitude, Dawes/Rayleigh resolution and useful-magnification range. Enter aperture, telescope focal length, an eyepiece focal length and its AFOV (metric mm or imperial inches), pick a target (deep-sky, planetary, lunar or terrestrial), and get a scaled field-of-view overlay plus target-specific advice on exit pupil and framing.
Quick start
Call this tool from your code in three languages.
curl -X POST 'https://api.elysiatools.com/en/api/tools/telescope-field-of-view-calculator' \
-H 'Content-Type: application/json' \
-d '{"aperture":203,"focalLength":2032,"eyepiece":25,"afov":60,"units":"metric","target":"deepsky","distance":0,"showOverlay":true}'API reference
Send a POST request with your inputs as JSON. File parameters require a separate upload first.
Endpoint
POST https://api.elysiatools.com/en/api/tools/telescope-field-of-view-calculatorParameters
| Name | Type | Required | Description |
|---|---|---|---|
| aperture | number | Yes | — |
| focalLength | number | Yes | — |
| eyepiece | number | Yes | — |
| afov | number | Yes | — |
| units | select | No | — |
| target |
MCP integration
Add this tool to your Model Context Protocol server so AI agents can list and call it.
Server configuration
Add this block to your MCP client configuration:
{
"mcpServers": {
"elysiatools-telescope-field-of-view-calculator": {
"name": "telescope-field-of-view-calculator",
"description": "Compute telescope optics for visual astronomy: magnification, true field of view, focal ratio, exit pupil, limiting magnitude, Dawes/Rayleigh resolution and useful-magnification range. Enter aperture, telescope focal length, an eyepiece focal length and its AFOV (metric mm or imperial inches), pick a target (deep-sky, planetary, lunar or terrestrial), and get a scaled field-of-view overlay plus target-specific advice on exit pupil and framing.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=telescope-field-of-view-calculator",
"command": "",
"args": [],
"env": {},
"isActive": true,
"type": "sse"
}
}
}List available tools
After connecting to the SSE endpoint, list the exposed tools:
{
"jsonrpc": "2.0",
"id": 1,
"method": "tools/list"
}Call this tool
Invoke the tool by its id, passing arguments built from its parameters:
{
"jsonrpc": "2.0",
"id": 2,
"method": "tools/call",
"params": {
"name": "telescope-field-of-view-calculator",
"arguments": {
"aperture": 203,
"focalLength": 2032,
"eyepiece": 25,
"afov": 60,
"units": "metric",
"target": "deepsky",
"distance": 0,
"showOverlay": true
}
}
}