Ok, thanks a lot. One headache less
Glad this is really cleared up. So, it IS the
field of view, not the focal length after all... My wife is an optician and in the past 30 years, I learned quite a bit about optics and thus the confusion as this conversion of the focal lenght didn't make absolutely no sense to me.
I could ask one more dumb... So... why the heck the EXIF keeps messing with it at all?
OT: I have a "multipractic" Canon SX50 HS (for light travel it's a really good and handy solution) and found a YT video explaining how the 215mm actually gets recalculated to 1200mm equivalent exactly on the example of the field of view on this specific prosumer camera, and interesting enough, the EXIF file coming with the shots made with this one, actually never gives the 35mm equivalent numbers, only the actual focal lenght used for a specific shot.
---------- Post added 05-15-16 at 11:30 ----------
Ok, to prove I understand and your writing wasn't a waste of time...
If I replace my DA 50mm F1.8 with the Pentax-M 50mm F1.7, I'll get the same image, except the excess (difference between the FF and APS-C sensor size / field of view) will not fit on my APS-C sensor, so, I will get a cropped image of what I would get if I had a FF camera shooting from the same position/distance from a certain object...
OK, if I rethink, just for the sake of the argument, let's pretend that the DA 50mm lens wouldn't work with a FF camera...
Last edited by stein; 05-15-2016 at 02:34 AM.