Telling difference between 35mm and 50mm photos

I can see why you would like to know, I habitually give lens and camera descriptions on almost every photo's metadata after a lr import, and it can be a little puzzling at times, although my 28mm and 50mm are considerably easier to tell apart. I am going to vote for top 35 and bottom 50, as the angles of the wall in the violin shot appear to be considerably more distorted than the glass wall in the portrait. You won't always have straight edges to gauge this with, so I would suggest starting to document your shots with a notepad or something like the Android app Exif4Film (I am trying to train myself on this practice too).
 
The photographers should be able to tell by depth of field and field of view.

Only if you know that the same aperture was set and also know the distances to the various objects in the image are known.

IMO, lynnb gave a very nice "guesstimate" based on object size.
 
Well I'll tell you what my original guesses were:
  • Violins: 35
  • Yakitori: 50
I was pretty sure that Violins was taken with a 35. The main confusion was with the Yakitori shot. Since it was a lot darker and indoors, I'm guessing I would've put the 50/1.5 on by that stage. It was probably taken wide-open, 1/30 and from memory I was focusing with his ear. :)

This thread has answered the question of whether it's immediately obvious what focal length took what shot. Looks like it can be a struggle for most of us without having a point of reference for how far back the shooter was.
 
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