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THE FEUTEX TOOLKIT

Exposure Bracket Span

Calculate total stop coverage and extreme exposure times for centered brackets.

Photography workspace● Runs in your browser
01 Your input
02 Your result
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FormulaSpan = (frames-1)*step; Shortest = middle/Math.pow(2,(frames-1)*step/2); Longest = middle*Math.pow(2,(frames-1)*step/2)

Made for real tasks

  • Calculate total stop coverage and extreme exposure times for centered brackets.
  • Compare two scenarios by changing the inputs and rerunning the tool.
Explore step-by-step workflows →

Worked example

Inputs

Frames
5 frames
Step
1 stops
Middle
0.01 s

Expected results

Span
4 stops
Shortest
0.0025 s
Longest
0.04 s

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter frames, step, middle.
  2. Use consistent units shown beside each input. Run the calculation and review the assumptions below.

Try this example

{
  "frames": 5,
  "step": 1,
  "middle": 0.01
}

Accuracy and scope

Centered symmetric bracket. Choose odd frame counts for an actual middle exposure.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.