Canon EF-S
lenses are designed to work on digital cameras with a cropped sensor.
Canon has been producing cameras since the 1930s. Those early cameras used a screw mount system. As technology advanced, Canon developed its "FD" bayonet mount used on its manual focus lenses. In the 1990s, auto focus cameras became the standard, and Canon introduced its "EF" (electronic focus) bayonet mount. The lenses attached in a similar fashion but the levers used to control the lens aperture were gone, replaced with electronic connections for power and electrical signals. When digital arrived, Canon continued to use the "EF" mount. It has "EF-S" lenses designed for use on digital cameras with cropped sensors.
Instructions
1. Hold the "EF" mount Canon camera with the lens detached in one hand and a Canon "EF-S" lens in the other.
2. Line up the red dot on outside of the barrel of the lens with the red dot on the mounting ring on the camera. The camera red dot will be at the 12 o-clock position.
3. Place the lens on the camera and rotate it a quarter clockwise turn until the lens locks into the place. The lens is now attached to the camera.
4. Slide the "AF/MF" switch on the side of the lens to "AF" for autofocus. On a Canon digital camera with cropped sensor, you will need to calculate the actual focal length. If you are using a 60D, 7D or Rebel model, the crop factor is 1.6x. If you are shooting with a professional 1D-MkIV, the crop is 1.3x. The Canon 5D and 1Ds models are the only full frame bodies.
5. Hold the camera to your eye. If you have a 17 mm lens on the 60D, 7D or Rebel, it will have the same focal length as a 27 mm lens. If you have that same 17 mm on the 1D-MkIV, the lens will look like a 22 mm lens.
6. Compose and take your picture by pressing the shutter release till the camera shutter fires.
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