Dan, hasselblad lenses are another war, they are IF, Internal Focus lenses displace an inner element with the help of the focus ring. In LF we play with the Unit Focus way, so the focal is the well stablished value stated in the datasheet.
If we go to 35mm format, the Nikon 50mm f/1.4 is IF, the real focal varies depending on focus ring setting, instead the 50mm f/1.8 is Unit Focus, sporting focus breathing, aparent focal varies but the real focal not, it works like a regular LF lens.
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