Focus & Exposure

What do focus and exposure do? How do you check to see if your subject is in focus when shooting? How do you check to make sure your subject is exposed correctly? 
Focus is the act of concentrating your interest or activity on something. Manual focus is so important that most professional cameras don't even have an auto-focus feature. The iris is an adjustable opening (aperture), which controls the amount of light coming through (i.e. the "exposure"). Before using your manual iris you need to know what the correct exposure looks like in your viewfinder (note:if your camera has the option to adjust viewfinder settings, you'll need to do that first.) A good start is to set your camera on auto-iris and frame a shot with nice, even lighting. Correct exposure contains three main factors, aperture, shutter speed, and ISO. 

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