ExpoAperture Depth of Field Guide Frequently Asked Questions

Short Description
Will the ExpoAperture Depth of Field Guide work with my digital SLR camera? Yes. The ExpoAperture Depth of Field Guide will work as is with all full-frame 35mm and digital SLR cameras where the image sensor is approximately the same size as a full 35mm frame (24mm x 36mm). You may also use the Guide with digital cameras with a 1.5 or 1.6 equivalent focal length by referring to the Guide’s Focal Length Conversion Table; or with medium format film (120/220) cameras by referring to the Medium Format Film Instructions.

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My digital camera does not have a full size sensor; can I still use the guide by multiplying the actual focal length of the lens by the camera’s equivalent focal length factor? No. The equivalent focal length factor (or multiplier) is based on the linear relationship between a full size 35mm frame and the camera’s image sensor. The formulas used to determine depth of field are based on an exponential relationship of focal length to aperture size. Therefore multiplying the actual focal length by the camera’s equivalent focal length factor will not result in the correct answer for your camera.
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Can I use the ExpoAperture guide with my digital camera which has a 1.6 equivalent focal length? Yes. Many of the digital SLR cameras on the market today have either a 1.5 or 1.6 equivalent focal length. Taking this into consideration we have developed a Focal Length Conversion Table that will convert the actual focal length of your lens to one that will result in the correct depth of field when set on the Guide’s dial. Do not confuse the converted focal length with the equivalent focal length, they are not the same.
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