Almost exactly a year after the arrival of the EOS 40D, Canon has announced the 50D, which we're assured will be a sister-model, rather than a replacement. Recent history has seen Canon release new models every 18 months-or-so but it's been a busy year with newcomers such as the Nikon D300 getting a lot of attention in the 40D's keen-amateur/professional segment. The 50D is essentially a 40D body wrapped around a newly-developed 15 megapixel sensor that finally rectifies the situation in which Canon's XXD range trailed the company's entry-level line, in pixel terms. Canon is claiming that the new sensor's design (new manufacturing processes, redesigned photo diodes and micro lenses) mean that despite the higher resolution image noise has improved, something we'll be putting to the test later.
The other big change is the inclusion of a new, high-resolution LCD screen. 920,000 dots mean that it can convey 640 x 480 RGB pixels, making it effectively a VGA standard monitor. Three anti-reflection layers built into the screen do their best to keep it useable in bright conditions, too.
There are various other changes and added features, with many of them stemming from the first appearance of the Canon's Digic 4 processor. The key differences between the 50D and 40D are detailed below.
Model line history
| Model | Announced | Effective pixels | Auto focus | Continuous (JPEG) | LCD monitor |
|---|---|---|---|---|---|
| EOS D30 | Apr 2000 | 3.1 mp | 3 point | 3.0 fps, 3 frames | 1.8" |
| EOS D60 | Feb 2002 | 6.3 mp | 3 point | 3.3 fps, 8 frames | 1.8" |
| EOS 10D | Feb 2003 | 6.3 mp | 7 point | 3.3 fps, 9 frames | 1.8" |
| EOS 20D | Aug 2004 | 8.2 mp | 9 point | 5.0 fps, 23 frames | 1.8" |
| EOS 30D | Feb 2006 | 8.2 mp | 9 point | 5.0 / 3.0 fps, 30 frames | 2.5" |
| EOS 40D | Aug 2007 | 10.1 mp | 9 point | 6.5 / 3.0 fps, 75 frames | 3.0" Live view |
| EOS 50D | Aug 2008 | 15.1 mp | 9 point | 6.3 / 3.0 fps, 60/90 frames | 3.0" HR Live view |
Canon EOS 50D vs. EOS 40D feature and specification differences
 Canon EOS 50D  |  Canon EOS 40D | |
|---|---|---|
| Sensor | • 15.0 million effective pixels | • 10.1 million effective pixels |
| Image sizes | • 4752 x 3168 • 3456 x 2304 • 2353 x 1568 | • 3888 x 2592 • 2816 x 1880 • 1936 x 1288 |
| RAW files | • CR2 format, 14-bit • RAW full resolution • sRAW1 (7.1 MP) • sRAW2 (3.8 MP) | • CR2 format, 14-bit • RAW full resolution • sRAW (2.5 MP) |
| Image processor | DIGIC 4 | DIGIC III |
| Sensitivity | ISO 100 to 3200, extendable to H1 (6400) and H2 (12800). | ISO 100 to 1600, extendable to 3200. |
| Auto ISO | ISO 100 to 1600 | ISO 100 to 800 |
| Noise reduction | Four levels | On/Off |
| Auto lighting optimizer | Four levels | On/Off |
| AF adjustment | • All lenses or up to 20 individual lenses • +/- 20 steps | No |
| Viewfinder info | Now includes Auto Lighting Optimizer icon | |
| LCD monitor | • 3.0 " TFT LCD • 920,000 dots | • 3.0 " TFT LCD • 230,000 dots |
| Live view AF | • Quick mode (Phase detect) • Live view mode (Contrast detect) • Face detect (Contrast detect) | Phase detect |
| Peripheral illumination correction | • Profiles of 26 lenses includes • space provided for 14 extra profiles | |
| User modes | • Auto • Creative Auto • Program AE (P) • Shutter priority AE (Tv) • Aperture priority AE (Av) • Manual (M) • Auto depth-of-field • Portrait • Landscape • Close-up • Sports • Night portrait • Flash off • Camera user settings 1 • Camera user settings 2 | • Auto • Program AE (P) • Shutter priority AE (Tv) • Aperture priority AE (Av) • Manual (M) • Auto depth-of-field • Portrait • Landscape • Close-up • Sports • Night portrait • Flash off • Camera user settings 1 • Camera user settings 2 • Camera user settings 3 |
| High-speed continuous | • 6.3 fps • Up to 60 JPEG Large/Fine images • Up to 90 JPEG Large/Fine images (UDMA) | • 6.5 fps • Up to 75 JPEG Large/Fine images |
| Menu UI | Digic 4 interface | Same as EOS-1D series |
| Connectors | • USB 2.0 Hi-Speed • Video out • Mini HDMI connector • N3 type wired remote control • PC Sync flash terminal • Communication terminal on base for WFT-E3/E3A | • USB 2.0 Hi-Speed • Video out • N3 type wired remote control • PC Sync flash terminal • Communication terminal on base for WFT-E3/E3A |
| Menu languages | 25 | 18 |
| Custom functions | 25 | 24 |
| Weight | • No battery: 730 g (1.6 lb) • With battery: 822 g (1.8 lb) (measured) | • No battery: 740 g (1.6 lb) • With battery: 836 g (1.8 lb) (measured) |
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