Canon EOS Rebel T3i 18 MP

The Canon EOS Rebel T3i 18 MP CMOS Digital SLR Camera and DIGIC 4 Imaging takes the consumer level dSLR a couple steps closer to the mid-level Canon 60D with the addition of the rotating rear LCD screen, remote flash firing, and in-camera processing features. The already highly competent, older Rebel T2i already shared many important features with the 60D (and even features of the semi-pro 7D) including the 18 MP sensor, 63-zone exposure metering system, high ISO performance, HD movie capabilities, and Digic 4 image processor. 
The T3i is very slightly larger and heavier due to the addition of the rotating rear LCD monitor. And that is one of the biggest differences between the two cameras. Do you want and need a vari-angle rear screen or not? The other major difference is the ability of the T3i to remotely control multiple off-camera flashes. Like the 60D and 7D, you can use the built-in flash of the T3i to trigger other Canon Speedlites. Some other minor additions to the T3i include the Scene Intelligent Auto Mode, which is a feature borrowed from point and shoot cameras.
When in Auto mode, the T3i will make a determination of what type of scene you are shooting - close-up, portrait, landscape, etc. - and automatically configure the camera settings accordingly. However, if you want to use a powerful and costly digital SLR as a point and shoot, you should probably save the money and just buy a nice, high quality point and shoot like the Canon S95. Other additional but not essential upgrades include the in-camera processing Creative Filters, and the ability to choose different image size ratios and to rate your images. (Helpful hint: press the Q Button while in image playback and you can access features like rating, rotating, and Creative Filters.)
Sensor and Image Quality
All three cameras share a very similar sensor and 18 megapixels, and so their image quality will be virtually the same. All are capable of taking professional quality images.
Exposure Metering
The three cameras all share the latest 63-zone, dual-layer exposure metering system and 4 metering modes. That means they will all determine the exposure virtually identically and enable you to take properly exposed photos in most every situation, including difficult back-lit scenes. The size of the areas metered for Partial and Spot metering vary slightly between the cameras, but that isn't anything critical.
Autofocus
The T3i shares a similar autofocus system to the 60D, with 9 focus points and three auto focusing modes. However the 9 AF points of the 60D are more sensitive than those of the T3i: all are cross-type in the 60D, only the center is cross-type in the T3i. The 60D autofocus system is much less complex than the sophisticated AF system of the 7D with its 19 AF point system and its additional Zone, Spot, and Expansion focus modes. These various modes address how you want to deal with and group the numerous AF points. Plus the custom settings of the 7D allow one to customize how the AF system works - how it tracks subjects, how it deals with objects that come between you and your initial subject, how quickly it responds to these changes of possible subjects that are at different distances from you, etc. However, if you are not an avid sports photographer, a wildlife shooter, or someone who understands, needs, and will use the elaborate features of the 7D AF system, then this shouldn't sway you.
Canon EOS Rebel T3i 18 MP
Canon EOS Rebel T3i 18 MP
Construction
As you can probably figure out from the prices, each camera is not built the same. The T3i has relatively strong construction of a stainless steel frame with polycarbonate body. The 60D has a stronger and lighter aluminum frame and polycarbonate body, but not as strong as the 7D's magnesium alloy construction. The 60D also has some amount of weather sealing - more than the T3i, less than the 7D. But for most users, including even those using the camera daily or in travel situations, the construction of any of these cameras is far more than good enough, strong enough, and durable enough.
Controls
As with construction, the buttons and controls vary with these cameras. Unlike the T3i, the 60D and 7D have nearly every control an advanced photographer needs on the exterior of the camera and they also have the top LCD panel and rear Quick Control Dial that are not on the T3i. With all the cameras, any controls can also be easily accessed with the Q Button and Q Menu or in the other menus on the rear LCD monitor. The top buttons of the 60D set only one setting each, so this is less complicated than the multiple-setting buttons of the 7D. Canon has removed the white balance (WB) button on the 60D that the 7D has, but that isn't a big deal - use the Q Menu. Another change on the 60D is that the Multi-controller has been moved from the thumb joystick like the 7D and 50D and placed in the middle of the rear Quick-control dial. This doesn't change how it functions, and should just be a matter of getting used to the difference. If you plan on using your camera on Auto or Program most of the time, then the controls of the T3i are more than sufficient for your needs. If you work in Av, Tv, or M modes and need quicker and more direct access to your controls and the additional top LCD screen to view and change your current settings, then you need to consider the 60D or 7D over the T3i.
Canon EOS Rebel T3i 18 MP
Canon EOS Rebel T3i 18 MP
Menus and Custom Functions
These allow for greater control over customizing how the camera functions. The T3i has less Menu and Custom Function setting options than the 60D, and the 7D has yet a few more than the 60D. These settings enable you to customize the operation, function, and controls to work how you want them to, including things like exposure increments, peripheral illuminations correction for lenses (fixes dark corners), tweaking how the autofocus system operates, setting more precise white balance settings, and customizing which button does what.
Wireless Flash
Like the 7D and 60D, the T3i incorporates wireless flash triggering. This allows you to trigger multiple off camera flashes at different output levels. The T2i does not have this feature.
Articulating LCD Screen
The big new feature that the 60D and T3i have that the 7D and T2i do not is the articulating rear LCD screen. This may prove useful for videographers, as well as for setting up compositions while the camera is on a tripod, for macro use, or for using it from unusually low or high vantage points. Some users will be able to avoid buying an expensive angle finder because of this feature. There is also an electronic level in the 7D and 60D, visible in the viewfinder, rear LCD, or top LCD.
Viewfinder
The T3i has a pentamirror viewfinder with 95% coverage of the actual resulting image. The 60D has a large, bright pentaprism viewfinder with 96% coverage, not quite as nice as the nearly 100% view of the 7D pentaprism.
Processor
The T3i shares the same Digic 4 processor as the 60D. The 7D has dual Digic 4 processors. However, if you don't need to shoot dozens of continuous images, you probably won't notice any processing speed issues.
Continuous Shooting Speed
The T3i can shoot 3.7 frames per second. The 7D can shoot a blazing 8 frames per second, in which the photos barely change from frame to frame. The 60D can shoot a respectable 5.3 fps which is actually a more useful rate. If you need the extremely high fps for sports, wildlife, or other action shooting, get the 7D. If not, don't be swayed by this excessive feature.

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