Lumariver Depth of Field vs Zone Tool

The Lumariver Depth of Field Calculator is an app that helps you maximize the sharpness of your photographs. It’s intended for landscape, architecture and all other genres where the goal is to have a sharp image front to back. Rather than being a calculator for theoretical exercises it’s designed for being a practical tool in the field, and it has a thorough user manual that describes real use cases. The user interface is optimized for one-hand operation using scrollers. In addition to the normal depth of field calculator it supports tilted depth of field (tilt-shift lenses, Scheimpflug principle) as well as focus stacking. The functions you don't intend to use can be turned off to keep the user interface as clean and simple as possible. Custom circle of confusion sizes can be set, which in addition to a fixed number may be relative to airy disc diameter and/or pixel pitch. It even supports dual circle of confusion sizes, one “sharp” and one “soft” to make it easy to do controlled trade-offs in difficult situations. By entering your own camera(s) and lenses once you have them easily accessible by name making the workflow efficient in the field. Distances can be shown either in meters or in decimal feet.

With this tool you can calculate your exposure and needed adjustment for development. It uses zone system theory originally invented by Ansel Adams and Fred Archer. First decide zone of your shadows and measure the shadows. Then device highlight zone and measure the highlights. Measure these with the film ISO you are going to use. You also need to decide shutter speed in beforehand. The app calculates exposure aperture for you and also tells if you need to shorten (N+..) or expand (N-..) your development time. You will get best results with a spot light meter but mobile apps will probably do fine.