Pixel density for bird photography

[Kym]

The new D7000 and K-5 have 4.75 µm pixels. (23.7 x 15.7 16 Mpx (4992 x 3284))
http://www.dxomark.com/index.php/en/...rand3%29/Canon

Using Tannin's formula its 44058 px / mm² x 135mm² (cropped area) = 5.947Mpx

1.9MP - Nikon D700 (1.0 crop, 12.1MP)
1.9MP - Nikon D3 (1.0 crop, 12.1MP)
2.0MP - Canon 5D (1.0 crop, 12.7MP)
2.2MP - Nikon D40 (1.5 crop, 6.0MP)
2.5MP - Canon 10D (1.6 crop, 6.3MP)
2.6MP - Canon 1D III (1.3 crop, 10.1MP)
2.6MP - Canon 1Ds II (1.0 crop, 16.6MP)
3.3MP - Canon 20D, 30D (1.6 crop, 8.2MP)
3.3MP - Canon 5D II (1.0 crop, 21.0MP)
3.3MP - Canon 1Ds III (1.0 crop, 21.0MP)
3.6MP - Nikon D40x (1.5 crop, 10.0MP)
3.6MP - Nikon D60, D3000 (1.5 crop, 10.0MP)
3.6MP - Pentax K10D, K200D (1.5 crop, 10.0MP)
3.8MP - Nikon D3x (1.0 crop, 24.4MP)
4.0MP - Canon 40D, 400D (1.6 crop, 10.1MP)
4.2MP - Canon 1D Mark IV (1.3 crop, 16MP)
4.4MP - Nikon D90, D5000 (1.5 crop, 12.2MP)
4.4MP - Nikon D300, D300s, D90 (1.5 crop, 12.2MP)
4.5MP - Pentax K-x (1.5 crop, 12.4MP)
4.9MP - Canon 450D (1.6 crop, 12.2MP)
5.4MP - Pentax K20D, K-7 (1.5 crop, 14.5MP)
5.9MP - Nikon D7000 (1.5 crop, 16.3MP)
5.9MP - Pentax K-5, (1.5 crop, 16.3MP)
6.0MP - Canon 500D (1.6 crop, 15.1MP)
6.0MP - Canon 50D (1.6 crop, 15.1MP)
7.2MP - Canon 550D (1.6 crop, 18MP)
7.2MP - Canon 7D (1.6 crop, 18MP)

But the ISO performance of the K-5 and D7000 means you can shoot 2 or 3 stops faster !! (to be proven at this stage)