Canon on August, 2007 introduces its latest digital SLR for advanced
amateurs and semi-professionals: the EOS 40D.
The Canon EOS 40D is the first in this line to have 10 mega pixels.
The sensor is most probably based on the Canon EOS 400D and shares
its vibrating anti-dust front filter. It has been that it is rather
less noise-free than the former 8 and 6 mega pixels models. It has a
tendency to underexpose and to produce results, which are flat.
The Canon EOS 40D implementation is superior to the Canon EOS
400D,and resembles the Canon EOS 5D more in tone curve and color
rendering. It also has a very mild anti-aliasing filter, leading to
much crisper reproduction of near-extinction details.
The EOS Integrated Cleaning System combats sensor dust, while a
strong magnesium alloy body with weather resistance ensures lasting
The Canon EOS 40D has some odd noise reduction qualities, which mean
that 100 ISO is excellent, 200 ISO is good, 400 ISO is a bit iffy
then 800 ISO suddenly gets smooth again, 1600 ISO is acceptable and
3200 ISO is for emergencies only. At 800 ISO, though, you lose the
crisp details. The optimum is probably 200 ISO.
A key advancement of the Canon EOS 40D is its new 9-point cross-type
AF system. All nine AF points can achieve focus on both horizontal
and vertical planes. A central AF point is capable of accurate
focusing up to aperture f/2.8, with eight outer points working up to
f/5.6. In response to requests, the dedicated AF Start (AF-ON)
button allows photographers to execute auto focus with their thumb.