Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Photography
Studio Lighting Ratio Calculator
Determine the exact fill light power needed to achieve a target lighting ratio in studio photography. Use this when balancing key and fill lights for portraits or product shots.
Fill in the required fields to see your result.
Photography
Magnification Ratio Calculator
Calculate the magnification ratio of a lens at a given subject distance β the ratio of subject image size on the sensor to actual subject size. Use it for macro photography planning to predict how large your subject will render and to choose between dedicated macro lenses, extension tubes, or close-up filters.
Fill in the required fields to see your result.
Key differences
| Studio Lighting Ratio Calculator | Magnification Ratio Calculator | |
|---|---|---|
| Category | Photography | Photography |
| Inputs required | 4 | 2 |
| Result | Required Fill Light Power (W) | Magnification Ratio (:1) |
| What it does | Determine the exact fill light power needed to achieve a target lighting ratio in studio photography. Use this when balancing key and fill lights for portraits or product shots. | Calculate the magnification ratio of a lens at a given subject distance β the ratio of subject image size on the sensor to actual subject size. Use it for macro photography planning to predict how large your subject will render and to choose between dedicated macro lenses, extension tubes, or close-up filters. |