Examples
Examples
Try the starting example
- Nominal focal length (mm)
- 100
- Lens-to-image distance (mm)
- 150
- Exposure multiplier
- 2.25
- Exposure compensation (stops)
- 1.169925
Try another scenario
- Nominal focal length (mm)
- 110.00000000000001
- Lens-to-image distance (mm)
- 150
- Exposure multiplier
- 1.859504
- Exposure compensation (stops)
- 0.894918
Calculation method
Calculation method
Exposure multiplier
Bellows factor=(extension/focal)²; stops=log2(factor).
Exposure compensation (stops)
Bellows factor=(extension/focal)²; stops=log2(factor).
Symbols and units
- a
- Nominal focal length (mm)
- b
- Lens-to-image distance (mm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Total lens-to-image distance, not extension beyond infinity; pupil ratio assumed1. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Total lens-to-image distance, not extension beyond infinity; pupil ratio assumed1.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.