Exposure Priority = 1

Aperture Setting =

Shutter Speed =

Zone Placement =

[https://i.imgur.com/2O48gwR.jpg]

Exposure =

Aperture Setting =

Shutter Speed =

Initial EV =

Adjusted EV =

This program is for people who are already familiar with the zone system. Explaining how the zone system works is beyond this description. A quick search online will educate anyone interested in learning about the zone system. "The Zone System is a photographic technique for determining optimal film exposure and development, formulated by Ansel Adams and Fred Archer."

- Wikipedia

One can input a meter setting and obtain alternate settings, based on a zone preference. It is similar to the old paper wheels that did the same thing. I have limited the aperture and shutter settings to the most popular ones found on cameras.

Contributed by

Henry Chavez

Take a meter reading of an area in a scene to photograph. Next select aperture priority. This setting locks the initial aperture in place and the program only adjusts the shutter speed. Let us say your camera indicates f/8 @ 1/125 for the area metered. Enter these two setting in the second and third fields. Finally, select "Zone III". The calculator should show "Less" Exposure, Aperture "f/8", Shutter "1/500", Initial EV "11" and Adjusted EV "13". You can select shutter priority to lock the shutter speed and the program will adjust the aperture setting. The remaining fields will not change, unless the Zone setting is changed.

ss1 =

ssv1 =

ss2 =

ssv2 =

stptbl = [[0.000125; 1] ; [0.00025; 2] ; [0.0005; 3] ; [0.001; 4] ; [0.002; 5] ; [0.004; 6] ; [0.008; 7] ; [0.0166666667; 8]; [0.0333333333; 9] ; [0.0666666667; 10] ; [0.125; 11] ; [0.25; 12] ; [0.5; 13] ; [1; 14] ; [2; 15] ; [4; 16] ; [8; 17]; [15; 18] ; [30; 19]]

aav2 =

aav1 =

apttbl = [[32] ; [22]; [16]; [11]; [8]; [5.6]; [4]; [2.8]; [2]; [1.4]; [1]]

zn =

Exposure Priority

Aperture Setting

Shutter Speed

Zone Placement

Exposure

Aperture Setting

Shutter Speed

Initial EV

Adjusted EV

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