Canon 40D - EOS 40D DSLR Bedienungsanleitung PDF herunterladen (Seite 3)

sensor) on a clear day. Increase the 40D exposure to match the 30D's and the noise results

will look similar to each other. Still quite good. The 1D Mark III shines in this comparison - as

it usually does.

he 40D's RAW files now contain 14-bit images which store 16,384 colors per channel (vs

4,096). Finer color definition should result in improved tonal gradation or color transitions.

When I'm post-processing RAW files for later use in Photoshop, I nearly always output to 16-

bit TIFF files (which actually contain 12-bit images prior to the 40D and the 1D Mark III). The

difference between 8 and 12 bits is significant when making certain adjustments - especially

contrast/levels/curves. So, the 14-bit files should be a nice upgraded feature. But, as I write

this, I'm still looking for a comparison to clearly show this advantage to you. The change

seems to be in subtly better image quality. Keep in mind that .JPG files are only 8-bit, they

will not retain the extra color information.

n obvious 14-bit change is the increased file size - about 40% larger than an XTi file. An

XTi/400D RAW image that weighs in at 10 MB would become a 14 MB file on the 40D. The

same 30D image is about 8 MB in size.

he improved microlens design likely contributes heavily to the reduced noise in images

from this sensor, but it is also likely the reason for the Canon EOS 40D's slightly improved

vignetting performance over the 30D. You can use the

Lens Vignetting Comparison Tool to

compare the 40D to the 30D.

First seen on the 1D Mark III and now found on the 40D is HTP (Highlight Tone Priority)

which is designed to prevent blown (RGB=255,255,255) highlights. An ISO value of at least

200 is required for this setting. The feature works. It should primarily be used when the scene

to be captured has some very bright highlights in it along with dark colors. A black tux beside

a white wedding dress is the classic illustration. But, I don't recommend using it unless

necessary as I prefer the contrast/tone curve of a standard shot better. Shadow noise will be

slightly higher in an HTP image.

brand new Canon feature on the 40D is Auto ISO - found by selecting the ISO value below

100. I got excited when I first heard of this feature - I thought it might be the ISO Priority

mode I've been hoping for. Alas, it is not quite what I was looking for. The function of Auto

ISO varies depending on the shooting mode that is selected - See page 60 in the manual (link

below) for the complete details. It looks very useful in the non-creative modes (including the

green square point and shoot mode), but is weighted strongly to ISO 400 in the creative

modes. Far to strongly for me personally.

Overall, the Canon EOS 40D's image quality is excellent. I'm pleased.

In the above spec comparison, we can see that, in addition to features I already mentioned,

the Canon EOS 40D has a higher magnification viewfinder than the 30D and 20D. While

the viewfinder continues to show 95% of the final image framing, the image appears larger in

the viewfinder. The key point being that the viewfinder has been enlarged to

accommodate this. It is brighter and sharper - eyeglass wearers will find it easier to use as

well. The improvement is noticeable - I like it. The ISO setting (100-1600 in 1/3 stop

increments as well as H/3200 if enabled) is visible in there as well.

he 40D is also the first DSLR in its class to accept interchangeable focusing screens

including the EF-D grid. I use a grid focusing screen in my

Canon EOS 1DS Mark II - it helps me

keep horizons level (I seem to have a deficiency in this skill) when I want them to be.

Model FOVCF Sensor Pixel Size Pixels/Megapixels Viewfinder

Canon EOS 400D Digital Rebel XTi 1.6x 22.2 x 14.8mm 5.7µm 3888 x 2592 10.1 .80x 95%

Canon EOS 350D Digital Rebel XT 1.6x 22.2 x 14.8mm 6.4µm 3456 x 2304 8.0 .80x 95%

Canon EOS 300D Digital Rebel 1.6x 22.7 x 15.1mm 7.4µm 3088 x 2056 6.3 .80x 95%

Canon EOS 40D 1.6x 22.2 x 14.8mm 5.7µm 3888 x 2592 10.1 .95x 95%

Canon EOS 30D 1.6x 22.5 x 15.0mm 6.4µm 3504 x 2336 8.2 .90x 95%

Canon EOS 20D 1.6x 22.5 x 15.0mm 6.4µm 3504 x 2336 8.2 .90x 95%

Canon EOS 10D 1.6x 22.7 x 15.1mm 7.4µm 3088 x 2056 6.3 .88x 95%

Canon EOS 5D 1.0x 35.8 x 23.9mm 8.2µm 4368 x 2912 12.8 .71x 96%

Canon EOS 1D Mark III 1.3x 28.1 x 18.7mm 7.2µm 3888 x 2592 10.1 .76x 100%

Canon EOS 1D Mark II N 1.3x 28.7 x 19.1mm 8.2µm 3520 x 2336 8.2 .72x 100%

Canon EOS 1D Mark II 1.3x 28.7 x 19.1mm 8.2µm 3520 x 2336 8.2 .72x 100%

Canon EOS 1DS Mark III 1.0x 36.0 x 24.0mm 6.4µm 5632 x 3750 21.1 .76x 100%

Canon EOS 1DS Mark II 1.0x 36.0 x 24.0mm 7.2µm 4992 x 3328 16.6 .70x 100%

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