Comments about ExpoImaging ExpoImaging ExpoAperture Depth of Field Guide for Normal Lenses:

If you are serious about photography and want total control over your shots then this aid will get you there. you can't learn this devise and not wonder about you next shot. I advise you to have your camera handy to get you familiar with the devise as it helps you understand what your reading. Then go experiment and take some shots.

Comments about ExpoImaging ExpoImaging ExpoAperture Depth of Field Guide for Normal Lenses:

I am a former naval officer who frequently used slide rules and wheel-like calculators to determine the ranges of ships. While our periscopes went away from rangefinder optics, I am somewhat 'old school' and use a Leica rangefinder camera. This is a wonderful tool for checking that my aperture is adequate for my desired depth of field. I am so glad that I purchased it, because my head was starting to hurt from all the mental math I was doing before. It is a very useful tool that becomes intuitive after reading the instructions and actually using once or twice.