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| p.1 #13 · 60d + 100-400L IS will it work? |
Paul Mo wrote:
Just be aware that by using those lenses on a 60D you are increasing their focal lengths by 1.6x.
Let's not mis-represent what is actually happening, or else our new member will spread confusion down the road.
Focal length never changes. It is a property of the lens. It doesn't matter if you have a medium format sensor, "full frame", APS-C sensor, or tiny camera phone sensor.
Due to the sensor crop size in the 60D, the field of view decreases. On a full frame camera, a lens with the same field of view would require a lens 1.6x longer in focal length to present the same image to the photographer. It's just easier for some to visualize having a longer focal length (I do it too), rather than speak in terms we uses less frequently.