Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Photography
Lens Focal Length Crop Factor Calculator
Converts a lens's actual focal length to its equivalent focal length on a different sensor size using the crop factor. Use it when switching between full-frame and APS-C or Micro Four Thirds camera systems.
Fill in the required fields to see your result.
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.
Key differences
| Lens Focal Length Crop Factor Calculator | Studio Lighting Ratio Calculator | |
|---|---|---|
| Category | Photography | Photography |
| Inputs required | 3 | 4 |
| Result | Equivalent Focal Length (mm) | Required Fill Light Power (W) |
| What it does | Converts a lens's actual focal length to its equivalent focal length on a different sensor size using the crop factor. Use it when switching between full-frame and APS-C or Micro Four Thirds camera systems. | 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. |