Understanding Digital Multipliers

efl
Originally uploaded by Normthephotoguy.

When you use most digital cameras, your lens has more reach than you may realize.

This is because digital sensors are usually smaller than 24x36mm, the size of 35mm film. This is called a digital multiplier. Each camera has a different multiplication factor depending on its sensor size. For instance, the most popular selling DSLRs in the world are made by Canon. They use sensors ranging for full size to much smaller.

With the exception of the Canon 1DS, 1DSMKII, 1D and 1DMKII, all Canon DSLRs have a digital multiplier of 1.6.

This means that when you use a 100mm lens, it has an equivalent focal length (EFL) of 160mm. Below, please find a chart that you can use to easily convert the standard 35mm lens focal length for use on your camera.Memorizing these focal lengths will help you be a better judge of what lens you need to make the right shot.