Canon EOS 1100D Instruction Manual page 45

Troubleshooting Guide
If the card already contains recorded images, the image number might
not start from 0001 (p.158).
Set the lens focus mode switch to <AF> (p.35).
To prevent camera shake, press the shutter button gently (p.38, 39).
If the lens has an Image Stabilizer, set the IS switch to <ON>.
In low light, the shutter speed may become slow. Use a faster shutter speed
(p.92), set a higher ISO speed (p.77), use flash (p.88), or use a tripod.
Horizontal stripes or irregular exposures can be caused by fluorescent
light, LED bulbs, or other artificial lighting during viewfinder or Live
View shooting. Also, the exposure or color tone might not come out
right. A slow shutter speed may solve the problem.
Under [_ Custom Functions (C.Fn)], if [3: Long exposure noise
reduction] is set to [0: Off] and [4: High ISO speed noise reduction]
to any setting other than [2: Strong], the continuous shooting speed
will return to normal. The maximum burst during continuous shooting
will also return to normal.
If you shoot something that has fine detail (field of grass, etc.), the file
size will be larger and the actual maximum burst might be lower than
the number mentioned on page 74.
Under [_' Custom Functions (C.Fn)], if [5: Highlight tone priority]
is set to [1 : Enable], ISO 100 cannot be set. If [0: Disable] is set, ISO
100 can be set (p.220).
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