Quote: Ah, but I was discussing flatness with respect to facial features for portraiture (flattening of nose, etc).
I know. that's what I meant when I mentioned people shots. although that doesn't restrict only to portraiture, but architectures as well which I mentioned (foreground versus background). as you might already know, wider lens are tricky and are shot at an specific angle inorder to avoid weird perspective if one was to shoot your typical portrait , landscape or architecture.
Quote: Also I wasn't asking if I should own a 70mm lens and a 77mm lens
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that wasn't my intention.
Quote: In any case, the difference between 24mm and 28mm is 1.16. Which is not exactly drastic.
I'm not sure where you came up with that number, and if it has got to do with perspective distortion, not FOV.
Quote: A third option would be to combine the lenses, or buy a wide-normal zoom, which makes a whole lot more sense than the 24-28 spread. The 28-35 spread makes more sense, but it's still close. I think a rule of 1.5x focal lengths makes good sense (24 - 35 - 55 - 85... seems logical).
I'm in agreement with a zoom if this was the case. however, if one would prefer using primes, the selection would be a 15 as UW, a 21 or 24 for wide, a 28 or 31 or 35 for normal wide, and a 43 or 50 for standard normal. take note that one lens for specific use. as far as a 28mm is used as a normal wide, it has to function nicely as a walk-around general purpose lens, meaning it has to be fast as well. it's too bad that Pentax doesn't have a fast 28 AF as of the moment.