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What is a parallax mistake?

post #1 of 2
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When you don't compensate for the offset of the viewfinder and the lens, resulting in close objects not being composed correctly? Is it common to make a parallax blunder when using a rangefinder and how does the camera know when you're wrong?
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post #2 of 2
Most rangefinders have parallax-correcting framelines, which means as you focus closer the framelines shift down and to the right. HOWEVER: most do not account for field shrinkage as well -- very few, in fact (the Fuji GA645 series is the only one I am aware of, but there may be more). The camera will never know when you are wrong, but you will after extensive use. Rangefinders, while some would argue are more simplistic in use, actually have a much larger learning curve than an SLR because what you see is not always what you get.
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