Frantisek a �crit :
It wasn't odd at all.
Such lengths as 55 or 58mm gave perfect lifesize viewing with
viewfinders of the SLRs they were introduced along with.
That is one of the reasons.
Another might be that it is easier to design a superfast lens with
narrower field of view and longer clearing distance from the swinging
mirror, thus many of the early super-fast lenses (f/1.2, f/1.4) were
slightly longer.
Frantisek
Yeah I can say the K 55 1.8 with my KX is just an exact fit with what my
other eye (the one not behind the viewfinder) is seeing. It makes the
looking with both eyes open (so you can easily watch what happens around
you) a breeze.
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Thibouille
