High Iso Noise Reduction; Highlight Tone Priority - Canon EOS 40D White Paper

High ISO Noise Reduction

Highlight Tone Priority

[Auto] ISO Speed Settings
Shooting mode
Set within ISO 400-800 so that the respective shutter speed will not cause camera
P/Av/
shake under the current lighting conditions.
A-DEP
If overexposure will result at ISO 400, a lower ISO speed, as low as ISO 100, is set.
Creative Zone
modes
If overexposure or underexposure will result at ISO 400, the ISO speed is shifted
Tv
within 100-800. (=EOS-1D Mark III's. C.Fn I -8-2)
M Fixed at ISO 400.
7/l/
Automatically set within ISO 100-800, according to the brightness.
c/N/
Basic Zone
modes
Automatically set within ISO 100-800, according to the brightness.
s
p Fixed at ISO 100.
Set to ISO 400 in all shooting modes. If overexposure would result in fill-in flash, a
With flash
lower ISO speed, as low as ISO 100, will be set.
The automatically-set ISO speed is displayed in the viewfinder and on the LCD panel
while the metering is active. In the Basic Zone modes, the automatically-set ISO speed
range is 100-800,* 1 stop greater on the high end than with the EOS 30D.
* Standard output sensitivity. Recommended exposure index.
Long exposure noise reduction is equal on the EOS 40D and 30D cameras. [Off], [Auto],
or [On/always applied] can be selected. The time required for noise reduction process-
ing is equal to the duration of the original exposure; the next photograph cannot be
shot until noise reduction processing in progress is complete.
High ISO noise reduction (C.Fn II-2) can be used for images taken at a high ISO speed,
as with the EOS-1D Mark III. Although some noise reduction is applied at all ISO speeds,
it is particularly effective at high ISO speeds. However, at low ISO speeds, noise in the
shadow areas is, in fact, further reduced. Also, when [High ISO speed noise reduction]
is set, the maximum burst during continuous shooting will decrease to 8, regardless of
the image-recording quality.
Highlight Tone Priority seeks to improve highlight detail. The range is extended between
18% ("middle") gray and the maximum highlight tone. This makes the gradation finer
from the grays to the highlights and reduces blown highlights. The function limits the
settable ISO speed range to 200-1600.*
* Standard output sensitivity. Recommended exposure index.
III. PERFORMANCE
ISO Speed Settings
8