Some quick and dirty High ISO test shots on the 40D , in camera Noise Reduction Off , from raw to Jpeg , cropped , resized no post processing done.
All the shots were taken handheld in the shade with marginal lighting.
Looks pretty good to me, in such trying condition, as far as noise level is concerned at ISO 3200.
AF on the slow boat like the T180 has improved noticeably on the 40D body.
The Plane was the first customer on my 40D !
#1 ISO 1000 1/60 F/7.1
#2 ISO 3200 1/120 F/10
#3 ISO 3200 1/30 F/9
#4 ISO 1250 1/250 F/5.6
#5 ISO 3200 1/100 F/7.1
#6 ISO 3200 1/125 F/8