Plate-solving scale
Give the solver a trustworthy search envelope.
Derive image scale, field dimensions and bounded solver scale from the saved optical train.
Purpose and method
What this calculator does
What scale should I give my plate solver? Derive solver scale bounds and sensor field from the imaging train.
In words: Focal length and effective pixel pitch determine the expected solver scale.
Change a value and the result updates immediately. Use the actual solved or measured focal length when available; reducer spacing and focus position can shift the nominal scale.
Working geometry
Solver search geometry
Pixel pitch and focal length set image scale, field dimensions and a bounded scale search interval.
Inputs
Optical scale and image dimensions
Calculated now
Solver hints
- Image scale
- 1.55 ″/px
- Field width
- 2.69 °
- Field height
- 1.80 °
- Solver scale minimum
- 1.40 ″/px
- Solver scale maximum
- 1.71 ″/px
Governing equation
In words: Arcseconds per pixel equal 206.265 times pixel pitch in micrometres divided by focal length in millimetres.
Show the working
The calculator applies the equation above to the values currently entered, without rounding until this display.
- Image scale
- 1.55 ″/px
- Field width
- 2.69 °
- Field height
- 1.80 °
- Solver scale minimum
- 1.40 ″/px
- Solver scale maximum
- 1.71 ″/px
Use the actual solved or measured focal length when available; reducer spacing and focus position can shift the nominal scale.