By Mayank Bhatnagar

Since the Canon EOS 50D launch just two days ago, internet forums have been abuzz with what is perhaps Canon's main imaging technology breakthrough this year: the new (CMOS) sensor design with redesigned photo diodes and gapless micro lenses. According to Canon's Chuck Westfall, this new technology in the 50D, which features Canon's highest pixel count (15 megapixel) APS-C sensor to date, will result in approximately 1-1.5 stop better high ISO noise performance as compared with the 10 megapixel 40D (Source: Rob Galbraith). There may even be an improvement in dynamic range.

The new technology is beautifully illustrated on page 3 of DP Review's hands-on preview of the EOS 50D.

The following two key points from the preview are worth noting:
1. The EOS 50D sensor has gapless micro lenses, which apparently significantly increases the efficiency of each pixel.
2. Canon is claiming that the new manufacturing process plus redesigned photo diodes and micro lenses extend the light gathering capabilities of the sensor.

Here is an extract from EOS 50D's official press release:

Outstanding, clean images

A newly designed 15.1 Megapixel CMOS sensor delivers ultra-detailed, low-noise images – ideal for large-scale reproduction or creative cropping. New manufacturing processes, plus redesigned photo diodes and microlenses, extend the light gathering capabilities of the sensor – allowing more pixels to be fitted on the CMOS sensor without compromising image quality. These changes ensure improved high ISO performance and low noise. High-speed, low light shooting is enabled by ISO levels of 3200, expandable to an ultra-sensitive 12800.

While tests / comparisons are needed to verify Canon's claims, the new technology could have far reaching consequences for compact cameras, whose small sensors are currently marred by issues of noise and poor dynamic range. This technology is not speculative; it is here, and there is no apparent reason why it would not soon find its way into compact cameras, perhaps beginning with high end models. If the technology lives up to its claims, it may ultimately be a bigger breakthrough for compacts than it is for DSLRs today!

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Mayank Bhatnagar is a New Delhi and Jaipur (India) based Fine Art Photographer, Graphic Designer, and Illustrator.