Nikon’s D300s is without a doubt the main rival for the EOS 7D. In the past Canon and Nikon used to pitch many of their DSLRs in-between each other, so you’d have, say, the EOS 50D roughly sandwiched between the D90 and D300. But with the EOS 7D, Canon’s aiming for the same high-end cropped-sensor market as Nikon’s D300s – and with similar pricing, both cameras are absolutely going head-to-head.
There’s certainly a lot of similarities between the two rivals. Both have tough build quality, APS-C sized CMOS sensors, 100% viewfinders with roughly the same apparent size (the 7D’s fractionally greater magnification off-set by its fractionally smaller sensor), both have 3in screens with VGA resolution, built-in wireless control of flash guns, HDMI ports, on-demand LCD graphics in the viewfinder, external microphone jacks for their movie modes, electronic levelling gauges, metering systems which take colour information into account, and shutter blocks rated at 150k actuations. Both models also sport HD video capabilities, very fast continuous shooting and sophisticated AF systems, but it’s the fine detail within each where the differences really emerge.
Starting with the most obvious difference though, the EOS 7D boasts 18 Megapixels to the D300s’ 12 Megapixels. When equipped with a decent lens, the 7D certainly can resolve more detail than the D300s, and despite having 50% more pixels in total, the noise levels are actually quite similar at the lower end of the range. You can see a full report in our results section.
In terms of comparing numbers though, the 7D has more than just higher resolution in its favour. It has double the maximum sensitivity (12800 ISO versus 6400 ISO), slightly quicker continuous shooting (8fps versus 7fps for the bodies alone and the advantage of maintaining this for 14-bit RAW files when the D300s falls in speed), and the choice of HD video resolution and frame rates, when the D300s only offers 1280x720 fixed at 24fps. The 7D also comes with free remote control software.
In its favour, the D300s boasts dual memory card slots allowing you to record duplicate images to both cards for instant backup, or RAW files to one and JPEGs to the other for easier management. It also features much better exposure bracketing (up to nine frames compared to just three on the 7D), a built-in intervalometer and many more auto-focusing points (51 versus 19) although it’s lacking the 7D’s zoning and other innovative AF options.
Ultimately while the dual card slots, 51 AF points and exposure bracketing are definite advantages over the EOS 7D, the Canon is better-featured overall. But at this level a great deal boils down to personal preferences on ergonomics and brand loyalty, not to mention existing investments in lenses and accessories. As such we expect the D300s to remain a big seller despite its toughest competition yet. One thing’s for certain: Nikon no longer has the high-end APS-C market to itself."