Exposure Assistant

Approximate exposure for various B&W films (and some color films) in low light.

This application approximates the length of exposure for various B&W films (and some color films) in low light situations. In low light, extra exposure is needed due to reciprocity failure (also known as the Schwarzschild effect). As such, your camera's meter is not accurate in low light. This application approximates the proper exposure time (based upon manufacturers datasheets). A timer is now included in the application.

The application warns when the user enters an exposure longer than described in manufacturer's datasheets. Although the exposure in these instances is crudely approximated by mathematical extrapolation, it is crucial that users conduct their own exposure tests in these very long exposure situations.

Current supported films:

Adox CHS 25/50/100

Adox CHS 100 II

Adox CMS 20 II

Adox Silvermax 100

Agfa APX 100/400

Bergger Pancro 400

Fomapan 100

Fomapan 200

Fomapan 400

Fuji Acros 100

Fuji Acros II 100

Fuji Provia 100F

Fuji Velvia 50

Fuji Velvia 100

Fuji Pro 160 NS

Fuji Pro 400H

Fuji Superia 200/400

Ilford Delta 100

Ilford Delta 400

Ilford Delta 3200

Ilford FP4 Plus 125

Ilford HP5 Plus 400

Ilford Ortho Plus 80

Ilford PanF Plus 50

Ilford SFX 200

Ilford XP2 Super 400

Kentmere Pan 100

Kentmere Pan 400

Kodak Ektar 100

Kodak Portra 160/400

Kodak TMAX 100

Kodak TMAX 400

Kodak Tri-X 320/400

Rollei IR 400

Rollei Ortho 25 Plus

Rollei Retro 80S

Rollei RPX 25

Rollei RPX 100

Rollei Superpan 200

Rollei RPX 400