Choose your tool
No tools match your search.
Flash Guide Number Aperture Estimate
Online flash guide number aperture estimate. Guide number must be quoted at ISO 100 for the chosen zoom and modifier.
Your results will appear here.
Three steps. That’s it.
A useful toolkit for text, data, images and calculations.
- 01
Add your input
Choose a tool, enter values or select a file.
- 02
Make it yours
Adjust the options and run the action.
- 03
Take the result
Copy the result or download its file.
flash guide number aperture calculator online
Use flash guide number aperture estimate online for guide number m, distance m, ISO. Guide number must be quoted at ISO 100 for the chosen zoom and modifier. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
How to use it
Enter guide number m. Set distance m, ISO. Select Calculate and check the labeled output. Copy or download the JSON result.
Options and example settings
Calculation method
f_number = guide_number_m*sqrt(ISO/100)/distance_m (^ means exponentiation; trig functions ending in d use degrees).
Worked examples
Apply flash guide number aperture estimate to the case below, keeping the displayed units and assumptions. Guide number must be quoted at ISO 100 for the chosen zoom and modifier.
Flash Guide Number Aperture Estimate — worked case
Settings: distance m: 5; ISO: 100
Input:
40
Calculated result for these inputs:
Output:
{
"f_number": 8
}Choose the right tool
Exposure equivalence, depth-of-field equivalence and file storage describe different questions. Review whether a value is a focal length, a crop factor, a shutter time, a frame rate or a bitrate before calculating.
Limitations and common mistakes
- Guide number must be quoted at ISO 100 for the chosen zoom and modifier. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
- Use the displayed unit in every field. Ratios and percentages are different inputs; percent fields use values such as 25 rather than 0.25.
Frequently asked questions
How can I use flash guide number aperture calculator online?
Enter guide number m. Set distance m, ISO. Select Calculate and check the labeled output. Copy or download the JSON result.
Where is my input processed?
The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.
Useful next tools
Explore other tools
Open a tool below, use the search, or choose a category to browse its full collection.
- Exposure Stop Difference Calculator
Online exposure stop difference calculator. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
- Aperture Exposure Compensation
Online aperture exposure compensation. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
- ISO Shutter Compensation Calculator
Online iso shutter compensation calculator. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
- ND Filter Exposure Time Calculator
Online nd filter exposure time calculator. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
- Neutral Density Optical Density Converter
Online neutral density optical density converter. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.
- Sensor Crop Factor from Diagonal
Online sensor crop factor from diagonal. Geometric or data-budget estimate. Sensor behavior, processing, focus breathing and recording overhead are excluded unless explicitly modeled.