Long exposure photography calculator
About the calculatorThis long exposure photography calculator allows you to find the right exposure times for different films with reciprocity, digital sensors, aperture values, shutter speeds and filters.
Typically this will help you for long exposure photography with neutral density filters (ND filter) or night photography in B mode (bulb), whether you are using a digital camera (DSLR), a color or black and white film camera, or a pinhole (camera obscura).
Set your timer with the right exposure time and shoot!
Reciprocity failure data and calculationsReciprocity failure (Schwarzschild effect) calculated times and adjustments are based on technical data published by the film manufacturers, taking into account the limitations and deviations mentioned.
The calculations included are based on either functions describing the reciprocity failure curve of a film or polynomial equations allowing the input of verified values.
Calculated times may differ slightly from the manufacturers' technical data for long exposures without significant consequences.
I use these measurements myself, having created this tool get different results very quickly with minimal manipulation or calculation.
Adding new films or filtersIf you would like to add a film or filter not listed, please contact me so that I can research and complete the list.
Did you like this article?If this article has helped you progress or enlightened you on certain points, that's the goal, mission accomplished!
Others might be interested too, so don't hesitate to share it :
- on social networks,
- photography forums,
- your acquaintances having the same passion or job as you,
- to other members of the photography club you belong to,
- with a link on your website,
- on other publishing platforms.
Thank you very much and good continuation to you.
Leave a message
6 months ago
I like your program. Often when I am out trying to catch a picture I have no way to access the program do to no phone service. So I miss the picture or I try and guess setting. Do you think you will be making this down loadable in the near future. Thank you.
6 months ago
Very good tool
7 months ago
Hello! This is amazing! Thank you so much for having this available for the public! You’re definitely an MVP! Wanted to see if you can add the following to to the list: -lomography 400 -cinestill 800t -cinestill 50D Thank you!
8 months ago
Nice work, very useful tool for all photographers
14 months ago
Hi Denis, I just wanted to say thank you for this amazing calculator! I'm using it in the field for film photography and it's helping a lot. You should make an app! My best from Japan Francesco