Preview based on a pre-production Canon EOS 50D

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 x0D 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 the noise is actually lower than the 40D, something we'll obviously be putting to the test when we get our hands on a production model.

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.

Preview based on a pre-production Nikon D90

Almost exactly two years after the D80 was announced comes its replacement, the rather predictably named D90. The D80 has been one of Nikon's quiet successes, and even today, despite being positively Methuselah-like in digital camera terms it continues to sell and often makes its way into our top 10 most clicked on cameras. Because it looks so similar to the D80 the D90 appears at first glance to be one of those rather subdued incremental upgrades, but dig a little deeper and you'll find there's plenty to keep Nikon fans happy.

First and foremost there's a new CMOS sensor, which Nikon claim produces D300 quality output at up to ISO 6400 and - one of several features to 'trickle down' from higher models - the same highly acclaimed 3.0-inch VGA screen as the D3/D300. Naturally it has Live View with contrast-detect AF and it would have been surprising had it not sported some form of dust removal system. More surprising is the inclusion of the world's first DSLR movie mode (720p HDTV quality, no less) and HDMI output, though as we'll see later it does come with some limitations. A lot of the core photographic spec is the same as or very similar to the D80, though there is a new shutter and an implementation of the 3D tracking AF seen on the D3/D300.

And it's not just the high end models that have lent features and technology to the D90; the user interface has been given the same user-friendly treatment as the D60, as have the retouching options. As it was explained to use the D90 is intended to appeal to the broadest audience of any Nikon SLR, from first-time 'step up' customers moving from a compact to serious amateurs wanting comprehensive photographic control without the cost and weight of a D300. Whether the D90 turns out to be a jack or a master of all trades we'll discover when we get a final production body to review, but our early impressions are overall pretty positive. Note that for the moment the D80 will continue to be sold, possibly well into 2009 - expect to see prices falling as soon as the D90 settles in.

Nikon D90 Key Features

• 12.9 megapixel DX-format CMOS sensor (effective pixels: 12.3 million)
• 3.0-inch 920,000 pixel (VGA x 3 colors) TFT-LCD (same as D3 and D300)
• Live View with contrast-detect AF, face detection
• Image sensor cleaning (sensor shake)
• Illuminated focus points
• Movie capture at up to 1280 x 720 (720p) 24 fps with mono sound
• IS0 200-3200 range (100-6400 expanded)
• 4.5 frames per second continuous shooting (buffer: 7 RAW, 25 JPEG fine, 100 JPEG Normal)
• Expeed image processing engine
• 3D tracking AF (11 point)
• Short startup time, viewfinder blackout and shutter lag
• Slightly improved viewfinder (96% frame coverage)
• Extensive in-camera retouching including raw development and straightening
• Improved user interface
• New optional compact GPS unit (fits on hot shoe)
• Same battery and vertical grip as D80
• Vignetting control in-camera
• 72 thumbnail and calendar view in playback