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Message: <blockquote data-quote="480sparky" data-source="post: 414122" data-attributes="member: 15805">Exposure, focus and back-button focus are three completely, separate things.As for exposure, you merely aim the camera at the clear, blue sky and set your exposure.  When shooting in manual, you simply dial in the ISO you want, and set the camera to the shutter speed and aperture desired to make a 'correct' exposure.Doing this has zip to do with focus.  Since you're shooting in manual, you can refocus to your heart's content.  The ISO, shutter speed and aperture won't change unless you decide to make the change.Once you compose the image to your liking, you can set the focus using whatever method trips your trigger.  BBF is one choice.  I don't think you can actuate the shutter from the back, though.</blockquote>