Canon 40D - EOS 40D DSLR Manual de usuario descargar pdf (Pagina 7)

utofocus is one of the most important camera functions for most people - OOF (Out of

Focus) shots are usually of no value regardless of their image quality. While some have

mastered manual focus, I find that the camera is usually better than me at this job (OK -

usually MUCH better). So, it is welcomed news when an improved AF system is introduced

- such as the one in the Canon EOS 40D.

From the Canon USA Press Release: "While the EOS 40D SLR maintains the nine-point wide

area AF coverage first introduced on the EOS 20D camera, Canon has made significant

improvements to its speed, precision and functionality, minimizing subject recognition

problems in the process. The EOS 40D camera's completely redesigned nine-point AF sensor

provides cross-type AF measurement at all nine focusing points for maximum apertures up to

f/5.6, and for the first time in any EOS camera, the central AF point offers enhanced precision

for both vertical and horizontal subject contrast when using EF or EF-S lenses featuring

maximum apertures of f/2.8 or faster. AF calculation speed with the EOS 40D camera is 30

percent faster than the EOS 30D model."

hat is great stuff. Many people are indicating a noticeable difference in this new AF system -

especially in low light/low contrast situations. I am finding this difference hard to detect when

comparing the 40D and 30D side-by-side - I'm not seeing a big difference even in low light.

I've tried these two bodies with a variety of lenses in a variety of light and subject contrast

levels. The 30D was fast focusing, and the 40D appears at least as fast. I am getting a good

F hit rate from the 40D - even at 6.5 fps in AI Servo mode while shooting sports - some

improvement is noticeable here. Overall, the 40D's AF performs very respectably in the

many varied situations I've put it up against.

Bringing our ears into the equation, following are some MP3 files containing the 40D's shutter

sounds. To my ears, the 40D is noticeably quieter than the 30D (very nice), but the

sound is a bit buzzier (not quite as classy). There seems to be a vibration noise and feel

during the process. The burst sequence was shot at max shutter speed - 1/8000 sec.

Obviously, a slow shutter speed may not be able to achieve this frame rate (1/2 sec for

example). Note: I'm not satisfied with the db levels in the burst comparison below - I don't

feel it adequately shows the 40D as being quieter than the 30D. The microphone was

identically positioned behind each camera's rear LCD in each of the recordings - the three

recordings were trimmed and combined. What is apparent is the frame rate and buffer depth

difference. In the comparison, each camera was fired at its fastest frame rates, fastest

shutter speeds (1/4000 for the XTi) with a wide open aperture until the buffer were filled.

Canon EOS 40D 6.5fps Burst

Canon EOS 40D Single Shot

Canon EOS 30D, then 40D, then XTi/400D Burst Comparison

With a 100,000 actuation-rated shutter, the 40D should fire away for a long time ...

Model Rated Shutter Life

Canon EOS 400D Digital Rebel XTi 50,000

Canon EOS 350D Digital Rebel XT 50,000

Canon EOS 40D 100,000

Canon EOS 30D 100,000

Canon EOS 20D 50,000

Canon EOS 5D 100,000

Canon EOS 1D Mark III 300,000

Canon EOS 1D Mark II N 200,000

Canon EOS 1DS Mark III 300,000

Canon EOS 1DS Mark II 200,000

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Canon 40D - EOS 40D DSLR Manual de usuario Pagina 7

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