Canon 40D - EOS 40D DSLR Manual de usuario descargar pdf (Pagina 2)

he above 100% sample crops were taken under controlled conditions using a Westcott

Spiderlite TD5 with 5000k fluorescent bulbs and a softbox. Identical exposures were manually

set - 1/30 and f/8 were the ISO 400 settings. The shutter speed was halved for each 1 stop

increase in ISO setting. Auto white balance and neutral Picture Styles were selected and

sharpness was set to "1" - a light but normal real world setting (noise gets sharpened). All

images were shot as RAW files, no noise reduction was used. The RAW files were processed

to 16-bit TIFF files, imported into Photoshop and output as a JPG using "Save For Web" at a

quality setting of 80.

I usually select a lighter

Color Checker block to use for my noise comparison, but in this case, I

felt the black block best showed the noise differences I'm seeing in real life shots. It is also

one one the noisiest blocks. Noise varies greatly from color/shade to color/shade, so it is

difficult to concisely, visually show the complete differences. Actually, the

Canon 1D Mark III

does not look its best in the above comparison as it is clearly the low-noise leader among this

group. The 40D's noise improvement over XTi/400D ranges from small at ISO 100 up to very

noticeable at ISO 1600. Below is another comparison ...

he above shots (100% crops) were taken with a tripod-mounted Canon EF 180mm f/3.5 L

Macro USM Lens

with available noise reduction turned off. I mention tipod-mounted not

because this is a detail/sharpness test (the above crops were not taken from the focus point

of the shot - and don't confuse noise with sharpness) but to explain the subject size

differences. The size of the subject in each image block is due to the sensor density of the

camera used - The lens was not moved between camera changes. You are looking at the

back window of a BMW - with a headrest inside and another SUV's mirror on the other side.

ll were shot with identical exposures (you can see the slightly lower sensitivity of the 40D

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Canon 40D - EOS 40D DSLR Manual de usuario Pagina 2