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Viewfinder system
The viewfinder on a direct vision camera often shows slightly more of the subject than will be recorded. This is intended to help you when framing. Lines, or corners marked in the viewfinder frame, below right, show the true picture area.
Direct vision viewfinders are also subject to a framing error created by "parallax". This is caused by the position of the viewfinder – above and to one side of the lens. for distant subjects , this slights misalignment does not affect the picture , but close-up the viewfinder may show more of the top and one side of the subject than will appear in the picture , see above . when working at the nearest limit of the simple camera’s sharpness –often around 6 fit ( 2m) – try to aim the
Camera a little high, so that the subject appears low in the frame, to avoid cutting off parts of the subject.