General discussion

What does this mean?

Canon EF lenses (including EF-S lenses)
(35mm-equivalent focal length is equal to approx.1.6 times the marked focal length)

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Focal Length

More precisely it is 1.54 times.

The last time I saw this question posted on a forum, it started a huge discussion in the understanding of effective focal length. It can be confusing.

So I will steer you to a professional on the subject:

http://www.dpreview.com/learn/?/Glossary/Optical/Focal_Length_Multiplier_01.htm

And that bit of knowledge will have you wondering about the sizes of sensor assemblies on other cameras.
Because smaller cameras (non DSLR) have a larger multiplier.

http://www.dpreview.com/learn/?/key=Sensor_Sizes


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The EF means Electronic Focus. The S means Short Back

Focus which is a type of lens mount on Canon cameras.

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OK, thanks

I see what they are talking about now.

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