Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual - Page 40
While pressing the lens release, button, turn the lens as shown by, the arrow., About Zooming, - is stm lens kit
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Attaching and Detaching a Lens About Zooming Detaching the Lens To zoom, turn the zoom ring on the lens with your fingers. If you want to zoom, do it before focusing. Turning the zoom ring after achieving focus may throw off the focus slightly. While pressing the lens release button, turn the lens as shown by the arrow. Turn the lens until it stops, then detach it. Attach the rear lens cap to the detached lens. Do not look at the sun directly through any lens. Doing so may cause loss of vision. If the front part (focusing ring) of the lens rotates during autofocusing, do not touch the rotating part. If you purchased an EF-S18-135mm f/3.5-5.6 IS STM lens kit, see "Handling Precautions" on page 340. Image Conversion Factor Since the image sensor size is smaller than the 35mm film format, it will look like the lens focal length is increased by approx. 1.6x. 40 Image sensor size (Approx.) (22.3 x 14.9 mm / 0.88 x 0.59 in.) 35mm image size (36 x 24 mm / 1.42 x 0.94 in.)