Originally posted by bmonki Technically your correct, but if your using your human eyeball to look, your incorrect. We can all do math equations all we want, if the FoV was as we see it no matter what, the 5.5 crop factor on the Q wouldn't be that big of deal and no one would be complaining for an official K to Q mount adapter, so your argument is just a statement to justify the fact that you have never shot anything larger than an APS-C.
This rambling made absolutely no sense whatsoever.
"35mm" is a completely arbitrary designation based on historical business/technical reasons. It was derived from older 70mm film stock, which Thomas Edison's lab decided to cut in half to approximately 35mm wide to adapt to his kinetoscope, add perforations for film feeding, and ended up with a frame size of 24x18mm (35mm cinema film). Later, still photographers took this same 35mm film stock, rotated the orientation (such that the 24mm horizontal dimension became the vertical) and doubled the width (18x2=36), giving you the 36x24mm that we now call "35mm" or "full frame". The reason it became popular is because it was significantly smaller, and thus more convenient, than large and medium format film, which are significantly older and stayed more popular than 35mm until 50 or so years ago. Since then 35mm has been the most popular format, and most photographers remember it the best, thus becoming the "standard". Nowhere in the entire history was any connection made to a human eye, with the arguable exception of the archaic measurement of viewfinder magnification, which by the way is
also not tied to any format, but rather indirectly by way of an arbitrary 50mm "standard" lens.
Further, there is
zero correlation between a human eye to
any size of sensor or any other flat plane medium. The human retina is spherical not a flat plane, and the image it and the lens produces is physically and geometrically
impossible to replicate using a flat plane medium (no more than the Earth can be displayed on a flat map without distortion). Rectilinear flat plane projection's (gnomonic projection) mathematical/geometric concepts of the focal length/FOV relationship have no equivalence to the human eye.