http://www.luminous-landscape.com/tutorials/understanding-series/viewfinders.shtml
Viewfinder image: this is your view of the world through
the camera, the little rectangle with black edges that shows you what part
of the world the lens is looking at and whether it's in focus or not.
Magnification: this refers to how big the viewfinder image
appears to be in an absolute sense. Like a batting average, it's usually expressed
as some decimal fraction of one. 1X is the size that things appear to be when
you look at them with your eye (a.k.a. "the naked eye"). Now, obviously,
magnification also changes when you use different lens focal lengths —
telephotos make things look bigger, wide-angles make things look smaller.
So camera magnification is specified with a 50mm lens. Less often stated is
that the lens must be set at infinity, because magnification also changes
slightly depending on how close or far you focus the lens.
Coverage: this compares what you can see in the viewfinder
with what will be recorded on the film. It's reported as a percentage. If
you can see through the viewfinder half of what will be on the negative, that
would be 50% coverage.
No comments:
Post a Comment