I know there's a lot of math that goes into accounting for crop factor and field of view between film and digital and traditionally what was considered a "normal prime", but I've noticed that what I capture with my 35mm lens is smaller than how it appeared to my eye. I put an SMC-M 40 on my
K5 today (didn't belong to me and I gave it back) and what appeared in my LCD looked the same as what I saw with my eyes standing on that same spot, at least from a perspective perspective.
My peripheral vision is of course much wider than my sensor..or film.
I hear mathematical explanations for "normal", that I can't dispute (I'm a bear of very little brain), but in layman's terms, my own experience tells me that it's 40mm. Sorry, I'm sure this is a well known fact, but I thought someone might benefit from reading this.
It kind of made me want a 40/2.8 ltd too. I always sort of winced at the idea of a pancake lens, but it looked and felt quite good on there in the flesh. The M 40 doesn't get much love in our review section, but the contemporary version does.