Canon EOS M200 Advanced User's Manual page 115

Do not point the camera toward an intense light source, such as the sun or an
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intense artificial light source. Doing so may damage the image sensor or the
camera's internal components.
Long bulb exposures produce more noise in the image than usual.
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If ISO Auto is set, ISO 400 will be set ( = 496).
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With [z: Long exp. noise reduction], you can reduce the noise generated
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during long exposures ( = 164).
To reduce camera shake, consider using a tripod and optional Wireless Remote
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Control BR-E1.
Manual Exposure Mode (M)
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