Manual flash: aperture, distance and power Manual flash: aperture, distance and power

Quick start

Manual flash: aperture, distance and power

  1. Enter the data or choose a source file.
  2. Review the options and start the tool.
  3. Check the result and download the required format.

Manual flash: aperture, distance and power

Calculate aperture, distance or the required fraction of manual flash power. Account for ISO, reference ISO and measured light loss; export the power table.

Use the guide number for full power at the stated ISO and flash-head zoom. Guide number and distance must use the same unit.

For direct manual flash within normal sync speed. TTL, HSS, reflector changes and bounce geometry are not predicted. Enter modifier loss only if it is known or measured; a 1 EV reduction halves light intensity, not guide number.

Other Tools

Percentage calculator
Percentage calculator
ETA calculator
ETA calculator
VAT and Sales Tax Calculator
VAT and Sales Tax Calculator
Break-Even Calculator
Break-Even Calculator
Unit Economics Calculator
Unit Economics Calculator
Subscription churn and LTV calculator
Subscription churn and LTV calculator

User reviews

Reviews are checked before publication. We publish genuine positive feedback and specific criticism. Spam and insults without useful detail are not published; profanity and personal details are masked. Positive votes are counted immediately; negative votes are counted after review.

Reviews reflect users’ experiences, not a guarantee of results or a description of the service limits. Use the rating buttons above to leave a review.

No published reviews in this language yet.