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The Canon EOS 40D is a 10.1-megapixel semi-professional digital single-lens reflex camera. It was initially announced on August 20, 2007 and was released at the end of that month. It is the successor of the Canon EOS 30D, and is succeeded by the EOS 50D. It can accept EF and EF-S lenses. Like its predecessor, it uses an APS-C sized image sensor, resulting in a 1.6x field of view crop factor.

 

The Nikon D90 is a digital single-lens reflex camera model announced by Nikon on August 27, 2008. It is a prosumer model meant as a replacement for the Nikon D80, fitting between the company's entry-level and professional DSLR models. Nikon gives the D90's Estimated Selling Price in the U.S. as $999.95 US for the body only and as $1299.99 with the Nikkor AF-S DX 18-105mm f/3.5-5.6G ED VR, which by itself sells for $399.95. Actual prices are generally lower. In May 2009, the D90 won the TIPA European Photo & Imaging Award, in the "Best D-SLR Advanced" category.

 

The EOS 5D is a 12.8 megapixel digital single-lens reflex (DSLR) camera body produced by Canon. The EOS 5D was announced by Canon on August 22, 2005, and at the time was priced above the EOS 20D but below the EOS-1D Mark II and EOS-1Ds Mark II in Canon's EOS digital SLR series. The camera accepts EF lens mount lenses, although third party manual lenses in conjunction with an adapter can be used on the camera, though without the use of autofocus. The EOS 5D is notable for being the first full-frame DSLR camera with a standard body size (as opposed to the taller, double-grip "professional" camera body style). It is also notable for its price, introduced at just over $3000 USD or £2000 GBP, which set a significant new low price point for full-frame DSLRs; its only full-frame competition at the time was the Canon 1Ds Mark II, which cost more than twice as much. On September 17th, 2008, Canon announced the camera's successor - the Canon EOS 5D Mark II.

 

The Nikon D300 is a 12.3-megapixel professional DX format digital single-lens reflex camera that Nikon Corporation announced on 23 August 2007 along with the Nikon D3 FX format camera. It is designated by Nikon as the ultimate in DX format performance . It is quite similar to the D700, with the main difference being that the D300 uses a DX sensor instead of an FX sensor. It offers both high resolution and high speed (being able to capture 6 frames per second, and 8 frames per second with the addition of an optional MB-D10 battery pack). As with most Nikon DX-format DSLRs, the Nikon D300 and MB-D10 are manufactured in Ayuthaya, Thailand. The D300 was officially discontinued by Nikon on September 11, 2009, replacing it with the Nikon D300s, released July 30, 2009. The D300 has not only a built in autofocus motor for all Nikon autofocus-lenses, but includes CPU and metering for older Nikon F-mount AI/AI-S lenses. Additionally, like the Nikon D3, D3X, D700 and D300s, the D300 supports PC-E lenses.