The 20D with it's 8MP gives good results and is less of a challenge for the lens and the photographer than the 15MP 50D ... The new high MP cameras are not only a challenge for the lens ... the photographer has to work really very careful to get the benefit of the higher resolution. EOS 20D 4.0/500mm + 1.4 conv. 200ASA 1/400 sec f13

Exposure time: 1/15"
F number: F8
Exposure program: Aperture priority
ISO speed rating: 200/24°

Shutter speed: 3.91 Tv (1/15")
Aperture: 6 Av (F8)
Exposure bias: -1.67 EV
Maximum lens aperture: 4.75 Av (F5.2)
Subject distance: 9.44 m
Metering mode: Pattern
Flash: Flash fired, compulsory flash mode
Lens focal length: 250 mm
DateTimeOriginal subseconds: 0.81"
DateTimeDigitized subseconds: 0.81"
Color space: sRGB
Image width: 5184 px
Image height: 3456 px
Focal plane X resolution: 5715.55 ppi
Focal plane Y resolution: 5808.4 ppi
Focal plane resolution unit: inch
Custom image processing: Normal process
Exposure mode: Auto exposure
White balance: Auto
Scene capture type: Standard