Canon EOS 650D review
EOS cameras have an enviable reputation, and it sometimes feels like Canon doesn't have to try too hard to maintain healthy sales. Last year's Canon EOS 600D was a relatively conservative update, with an articulated screen and wireless flash control but little else to tempt upgraders. The 650D might seem pretty conservative too. It looks almost identical, and the key specs – 18-megapixel sensor, 9-point autofocus, 3in articulated screen – haven't changed. However, there are some substantial improvements here, many of which address long-standing criticisms we've levelled at previous models.
Canon has finally ditched the three-year-old DIGIC 4 processor in favour of the DIGIC 5 chip used in various recent PowerShot cameras. This raises continuous speed from 3.7fps to 5fps, and also introduces in-camera chromatic aberration (CA) correction. This eliminates discoloured halos around high-contrast lines, and is something Nikon's SLRs have offered for many years. These twin benefits of the faster processor aren't available at the same time, though. With CA correction enabled, 5fps shooting lasted for just three frames before slowing to 2.1fps. With it disabled, it lasted for 29 frames and then slowed to 3.6fps. It's a shame that CA correction can't be set to switch off automatically when continuous shooting is selected.
Automatic high dynamic range (HDR) shooting is now available, and has a dedicated position on the mode dial for quick access. Curiously, the camera slightly crops and then enlarges the image back to 18 megapixels. More worryingly, we found that autofocus problems were quite common in this mode. There's also a new Handheld Night Scene, which combines three exposures to reduce noise. It just made things softer at ISO 3200 but proved its worth at ISO 12800.
For us, the 600D's biggest weakness was its slow autofocus in live view mode. Live view on an SLR bypasses the main phase-detect autofocus system, and the 600D's backup contrast-detect system was appalling, taking up to four seconds to lock onto subjects. For the 650D, Canon has integrated additional phase-detect autofocus points onto the sensor. This appeared to improve live view autofocus speeds, but only to an extent – it still took between one and two seconds to focus. That's still likely to be too slow for most people. It's also significantly slower than the Pentax K-30 we're currently mid-way through testing.
The main autofocus system has nine points, but this time they're all cross-type for increased sensitivity. Previously only the centre point was cross-type, which meant we rarely bothered to use the other eight points. However, we experienced the same autofocus reliability issues that we've seen on previous models when using the 18-55mm kit lens.
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