The Class of 2008

	Nikon D300

Both the Canon and Nikon models can accept an accessory wireless device for Wi-Fi transmission of images or to link to a GPS system or external storage drive.

While no such attachment has been announced for the Sony A700, it's unique among current DSLRs in that it has an infrared remote release, which can also function as a slide show controller. That may come in handy for showing off images from the Sony on an HDTV, since this camera (and the Nikon D300) have an HDMI interface for 1080i resolution video output to high-definition screens.

Tanks for the Memories

These babies are built. All of them have magnesium-alloy casings on top of metal frames -- stainless steel in the Canon, magnesium alloy in the Nikon, and aluminum alloy in the Sony.

The Canon 40D gets extra weathersealing, compared with its predecessor, the 30D. The Sony A700 packs protective gasketing on every external control, unlike the A100, and remains lighter than the 40D or D300. But the D300 takes the protection prize, with robust weathersealing similar to that of the D200, including a gasket surrounding its lockable CF card door. (There's no gasket on the Sony A700 card door.)

All three manufacturers offer optional battery grips with vertical shutter releases and weathersealing. Canon's is backward compatible with the EOS 20D and 30D.

The shutters on the Canon 40D and Sony A700 are rated for 100,000 cycles; the Nikon D300's for 150,000. Construction like this ensures that these cameras will see plenty of professional, as well as advanced amateur, use.

An aside: The Sony A700 is distinctly reminiscent of the late Konica Minolta Maxxum 7D, given its dual command dials and numerous external controls. We were impressed with the attention to detail, like the accessory battery grip that duplicates the ergonomics of the horizontal grip.

The Bottom Line

Any way you look at these three flagships of the midfleet, photographers benefit. Advanced amateurs get a new level of quality and image control. Pros have more options for backup bodies -- or primary cameras. And entry-level shooters will see technology from these cameras trickle down to lower-priced models. It's going to be a very good year for DSLR shooters.