The Canon EOS 50D is a feature-packed semi-pro DSLR which takes the already capable 40D, increases the pixel count by 50%, quadruples the sensitivity and packs in all the latest features � bar a movie mode. As such it�s a very impressive specification, and one which on the whole lives up to its promise.
Kicking-off with resolution, the EOS 50D packs more pixels into its cropped sensor than any model to date, so there�s obviously concerns over noise levels. But Canon�s bold claims of matching the noise levels of the earlier EOS 40D were confirmed in our High ISO tests. From 100 to 1600 ISO, the EOS 50D�s output really is very similar to that from the EOS 40D when viewed at 100% on a pixel level. At 3200 ISO, the 50D applies greater noise reduction, but tone it down a notch and again it looks similar to the 40D. Admittedly the 50D�s 6400 and 12800 ISO modes are a step too far, but it�s an impressive achievement to boost the total pixels by 50% without any perceptible compromise in noise levels over its 10 Megapixel predecessor at the same sensitivities.
It�s also important to remember these comparisons were made at 100%, viewing each pixel at 1:1 on a computer monitor. If you print images from the 40D and 50D at the same size, the 50D�s higher pixel count means any artefacts would appear smaller, so in this respect it has the advantage.
The use of gapless micro-lenses has improved sensor efficiency and allowed it to match the noise levels of its predecessor, although looking to the future, this is a trump card that can only be played once. Now the 50D�s sensor is already maximising its real-estate, the engineers will need to look elsewhere to improve efficiencies should they want to boost resolutions again without affecting noise.
Gordon Laing
more : cameralabs
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