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C H A P T E R 4
Teach Your Camera New Tricks
f
TV Bracketing Value
. This entry is used for modifying the exposure time
during a series. A value of 2 results in an exposure time multiplication
factor of 2
2
= 4. So, if you start with 1/100 sec, you will get a shutter
speed series of 1/100, 1/25, 1/400, 1/6, 1/1600, and so on. This type of
bracketing is typically used for HDR work (section 4.6.2). It can also be
used for getting the perfect exposure when AV bracketing is not avail-
able.
f
AV Bracketing Value.
This entry allows you to modify the aperture for
the individual shots in a series. For example, if you set the value to one
f-stop and the aperture to 5.6, you will end up with a series shot at ap-
ertures 5.6, 4.0, 8.0, 2.8, 11, etc. AV bracketing is not suited for HDR
work because the depth of field changes with each aperture change;
but it’s a good option for getting a perfectly exposed single image. This
menu entry is only available on cameras with a diaphragm.
f
Subj.Dist.Bracket Value
. This entry is used for focus stacking, which is
discussed in the next section.
f
ISO Bracketing Value
. This entry allows you to modify the ISO value. The
subentry
Value Factor
specifies a factor that is multiplied with the
ISO
Bracketing Value
—just to save you a few hundred keystrokes. The result
is added and subtracted from the original ISO value. For example, if you
start with an ISO value of 100, an
ISO Bracketing Value
of 2, and a
Value
Factor
of 10, you will end up with a series of 100, 120, 80, 140, 60, etc.
ISO bracketing is well suited for classical exposure bracketing when you
need the perfectly exposed single image, especially if AV bracketing is
not available. It is not as well suited for HDR work (see above) because
the signal-to- noise ratio changes with each ISO setting.
f
Bracketing Type
. There are three bracketing types. Choosing “+/–” will
result in a series with alternating over- and underexposed images, typi-
cally used for finding the perfect exposure and for HDR work. The op-
tion “–” will result in a series of increasingly underexposed images.
Finally, the option “+” will result in a series of increasingly overexposed
images. The last two options are often used for focus stacking.
f
Clear Bracket Value on Start
. If this option is enabled, the bracketing
values will be reset to default when the camera is powered up.
f
Add RAW Suffix
. When this option is enabled and you shoot RAW
images, a suffix is added to the names of the resulting RAW files, for
example,
IMG_2041_01.DNG
,
IMG_2041_02.DNG
,
IMG_2041_03.DNG
. This
allows you to easily identify the bracketing series later. However, in the
CHDK file browser of DryOS cameras (section 2.2), the files will show up
as
IMG_20~1.DNG
,
IMG_20~2.DNG
,
IMG_20~3.DNG
, because the file browser
is limited to 8.3
6
filenames on this platform.
6
At most, eight characters in front of the dot, three behind it.
Summary of Contents for Camera
Page 1: ......
Page 2: ...The Canon Camera Hackers Manual ...
Page 3: ......
Page 4: ...Berthold Daum The Canon Camera Hackers Manual Teach Your Camera New Tricks ...
Page 19: ...10 CH APTER 2 Cameras and Operating Systems ...
Page 25: ...16 CH APTER 3 ...
Page 85: ...76 CH APTER 4 Teach Your Camera New Tricks ...
Page 213: ...204 CH APTER 6 ...
Page 253: ...244 AP PENDIX ...