Long exposure photography calculator
20231202 - 2.1.4 - Added Harman Phoenix 200 film.
20231115 - 2.1.3 - Added Foma ORTHO 400 and Foma RETROPAN 320 Soft.
20231115 - 2.1.2 - Update for Foma FOMAPAN 100, 200, 300.
20231031 - 2.1.1 - Correction of aperture offset in certain cases.
20231016 - 2.1.0 - Option for display intermediate f-number values.
20231005 - 2.0.0 - Reconstruct the calculation to obtain more precise values.
20231005 - 2.0.0 - Display one and two-thirds intermediate values.
20230715 - 1.0.1 - Added AGFA APX films.
20220418 - 1.0.0 - Versioning implemented.
20211018 - 0.0.0 - Initial version.
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!
To save your information for your analog frames quickly (context photograph, GPS coordinates, aperture, speed, film type, ISO, notes, etc.) and directly on your smartphone use LYFDA.
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.
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Thank you very much and good continuation to you.