Compare calculators
Both calculators run independently β change the inputs on either side to compare results.
Reciprocity Failure Calculator
Calculate the corrected exposure time for long film exposures where the reciprocity law breaks down and film loses sensitivity. Essential for any film photographer shooting exposures longer than 1 second, especially astrophotography, night, and low-light work.
Exposure Calculator
Find the new shutter speed needed to maintain correct exposure after changing aperture. Ideal for photographers adjusting depth of field without altering brightness.
New Shutter Speed
0.06 s
0.0167-0.125 s (1/60 to 1/8) invites camera shake handheld; brace against a surface or use stabilization to stay sharp.
The new shutter speed preserves exposure when you change aperture; bands follow the photographic handholding guideline that shutter slower than about 1/60 s (0.0167 s) risks shake.
Key differences
| Reciprocity Failure Calculator | Exposure Calculator | |
|---|---|---|
| Category | Photography | Photography |
| Inputs required | 2 | 3 |
| Result | Adjusted Exposure Time (seconds) | New Shutter Speed (s) |
| What it does | Calculate the corrected exposure time for long film exposures where the reciprocity law breaks down and film loses sensitivity. Essential for any film photographer shooting exposures longer than 1 second, especially astrophotography, night, and low-light work. | Find the new shutter speed needed to maintain correct exposure after changing aperture. Ideal for photographers adjusting depth of field without altering brightness. |