Exposure Assistant v4.2

Matthew Bognar

About this app

Developer Description

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

What's New

Added Kentmere Pan 200.

Version Information

Version: 4.2
Downloads: 1K+
Updated on: Aug 18, 2025
Released: Mar 24, 2013
Requires: Android 9

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Exposure Assistant users say on Google Play

★★★★★

Herschel Pollard

Fab for pinhole. I've always estimated my pinhole shots based on experience...which can be hit or miss. I've ended up with some shots -- that I would have way underestimated times for -- that turned out perfectly thanks to this app (20 minutes instead of my estimate of "about 5-ish..."). Thank you for creating this!

★★★★

A Google user

Awesome app. Whish it would calculate based on stopping the film up or down. Are there any plans to add ISO values?

★★

A Google user

I found this app to be inaccurate when shooting Ilford films (Delta 100, Delta 3200, HP5, Pan F Plus). There is no option to choose whether or not you want to adjust for just exposure time or stops, you must adjust both. So good luck basing your exposure on a particular aperture. The compensations merely follow the graphs provided by the film producer and do not seem to be tested or accurate to my standard. Film selection is few. Research and testing are better methods for dealing with reciprocity.

★

Tom Gumpel

absolutely garbage. I was shocked to see that there was no trial before paying for this app, and no return option, but decided to try anyway. this is an utter waste of money. The app does not allow one to calculate time based on added filters, nor does it allow for adding fractions of time, such as 1/8...you must first calculate the decimal equivalent. Better to simply use chat gpt. save your money and refuse to support shoddy work

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