Canon EOS 1D Mk IV

• Launched: October 2009
• Type: Digital SLR
• Sensor: APS-H, 27.9 x 18.6mm
• Resolution: 16 megapixels
• Lenses: Canon EF (not EF-S)
• Key features: 10fps continuous shooting, full HD movies
• Links: Press release, Product page

Summary: High-speed digital SLR for professionals. It has a unique sensor size mid-way between APS-C and full frame, which puts it at a slight disadvantage to the Nikon D3s, though the Nikon only shoots standard HD movies.

Nikon D3s

• Launched: October 2009
• Type: Digital SLR
• Sensor: Full frame 'FX' format, 36 x 23.9mm
• Resolution: 12.1 megapixels
• Lenses: Nikon F (FX, DX in 'crop' mode)
• Key features: 9fps continuous shooting, high ISO performance; standard HD movies
• Links: Press release, Product page

Summary: Second-generation version of Nikon's original full-frame D-SLR optimised for speed, with a 9fps continuous shooting speed (11fps in 'crop' mode) and a maximum ISO raised to 12800.

Sigma DP1s

• Launched: October 2009
• Type: Fixed lens hybrid
• Sensor size: APS-C Foveon X3, 20.7 x 13.8mm
• Megapixels: 4.7 (x3)
• Key features: Foveon X3 sensor, fixed lens
• Lens: 28mm equivalent f4
• Links: Press release, Product page

Summary: Fixed lens hybrid camera using unique Foveon X3 sensor for low apparent resolution but high image quality. The plain design and fixed lens restricts its appeal to enthusiasts only.

Pentax K-7

• Launched: October 2009
• Type: Digital SLR
• Sensor size: APS-C, 23.4 x 15.6mm
• Resolution: 14.6 megapixels
• Lenses: Pentax KAF2
• Key features: In-built anti-shake, expanded dynamic range, distortion and chromatic aberration correction, standard HD movies
• Links: Press release, Product page

Summary: D-SLR for enthusiasts and professionals, featuring metal construction, good continuous shooting speeds and a host of well thought out and useful features.