Canon EOS 650D
The Canon EOD 650D / Rebel T4i is the company's latest addition to its novice-oriented 'Rebel' series. With more than two decades of continuous success in its film and digital incarnations, these little SLRs have been improved and refined to the point that Canon's biggest challenge is finding new ways to distinguish its updated models. Place the new EOS 650D / Rebel T4i alongside its predecessor, the EOS 600D / Rebel T3i, and the similarity in design and specifications may suggest nothing more than a nominal upgrade.
Indeed the headline specifications - 18MP CMOS sensor, 9-point AF sensor, 3:2 flip-out 1.04m dot screen are all familiar from the 600D. Look a bit closer, however, and each of these has been significantly improved, with an eye both to more seasoned users who demand SLR performance and compact camera upgraders who want a familiar feeling interface. The 650D also gains significance because it forms the basis of the Canon EOS M, the company's long-awaited entry into the mirrorless interchangeable lens market.
It is largely because of the rise of large sensor mirrorless models that in today's market an entry-level DSLR must offer more than just high image quality to entice compact camera upgraders. In the age of YouTube, quick and easy access to video recording capability is a must. And for users that are far more familiar with composing via an LCD screen than a viewfinder, live view performance is of no small concern. Of course the camera must still offer users a path to a more traditional DSLR-like experience, without which, they would be hard pressed to resist the temptation of a physically smaller 'mirrorless' camera.
The EOS 650D is Canon's attempt to meet these challenges head on, with new features aimed at improving its live view and video performance. It becomes Canon's first DSLR to offer continuous AF tracking while recording movies.
This is made possible by Canon's new 'Hybrid CMOS' sensor that now includes pixels dedicated to phase detection autofocus. The Hybrid AF system uses these to quickly set the lens to roughly the correct distance, then uses contrast detection AF to fine-tune focus. In theory, this should provide faster and more certain focusing for live view and video shooting compared to previous Canon models which rely on CDAF alone. You can read a more detailed explanation of this technology and see it in action on the AF performance page of this review.
The EOS 650D also becomes the first SLR from any manufacturer to feature a touchscreen. This is of the capacitive (contact sensitive) rather than resistive (pressure sensitive) type, behaving like that of a typical smartphone. In Live View and Movie modes the screen can be used to specify the point of focus and (optionally) release the shutter. It also supports iPhone-like multi-touch and gestures. The rear screen has been redesigned with no air gap between the display and cover glass in an attempt to reduce reflections and improve visibility in bright light. There's also an anti-smudge coating which aims to reduce the impact of its newfound touch-sensitivity.
Canon EOS 650D / Rebel T4i key features
18MP APS-C 'Hybrid CMOS' sensor
Phase detection AF from imaging sensor for Live View and Video
Continuous autofocus in movie mode with subject tracking
14-bit DIGIC 5 processor
ISO 100-12800 standard, 25600 expanded
5 fps continuous shooting
9 point AF system, all sensors cross type, central sensor F2.8 (from 60D)
63 zone iFCL metering
1080p30 video recording with built-in stereo mics
1.04m dot 3:2 touch-sensitive vari-angle ClearView II LCD (capacitive type, multi-touch support)
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