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Shooting with the Canon Rebel T3i (600D and Kiss X5) details the features, controls, and options in the Canon Rebel T3i camera. Author Ben Long provides an overview of a digital single lens reflex (SLR) camera and reviews the Canon Rebel T3i camera's components and basics of operation, including changing lenses, navigating the menus, shooting in Auto mode, and reviewing and managing photos on the camera’s LCD screen. The course also covers white balance options, advanced metering and autofocus controls, flash, and shooting HD video, and includes a chapter on sensor and camera maintenance.
is a darkening that can occur in the corners of your image, Canon calls this peripheral illumination or falloff. Vignettes most often occur with wide- angle lenses and sometimes a vignette can add a nice effect to an image. It can bring focus to the center of the frame. But most of the time you don't want vignettes in your image and your camera has a feature to remove these when you're shooting in JPEG mode. The camera removes vignetting by applying a brightening to the corners. And if it ever gets its calculations wrong or if it's a little too aggressive with its de-vignetting, or its peripheral illumination correction, you may want to turn it off.
Or, maybe you actually want some vignetting in your image. Maybe you're intentionally trying to vignette to get more focus to the center of your image. Right down here in the first shooting menu is Peripheral illumination correction. Hit that and I can just Disable it. Now notice though it's giving me some information here, Attached lens and it's saying EF-S18-55, 3.5-5.6. That is in fact the lens that I have on my camera. It's identified it properly and it's saying that Correction data is available. The firmware in this camera has a little database of lenses that have been profiled for their vignetting characteristics.
So what this is telling me is that it knows what lens this is and it knows exactly it thinks how to correct any vignetting problems. If you attach a lens and it's not in here, and third-party lens, Tamron and non-Canon lenses are not going to show up there, but your Canon lenses should. If it's a brand-new lens, you may not see Correction data available and you won't until you get a firmware update that updates your database to include information for that particular lens. In general, you are going to want to leave this Enabled.
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