Depth of field is limited, meaning the short distance an object appears acceptably sharp is very small.
it is impossible to contain a subject within this focus. changing the aperture doesn't change the depth of field but it adjusts the shutter speed.
Movements can be greatly magnified by both your subject and your camera. even the slightest breeze can cause blur, but alas! you can use flash to help reduce un-sharpness.
Working distance the space between the lens and the subject. this can be important for live subjects. such as wild animals, you need a greater working distance so you don't bother them. you can set a focal length to help get a better view of the subject without getting too close.
Auto flash exposure it can be inaccurate for very close working conditions and the circuitry can may not respond fast enough to prevent you photo from being over exposed. to solve this problems you can lower flash exposure by setting controls or setting the flash to manual.
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