how would someone identify the lens used in a particular photograph

>>2728101
you'd need to know the exact distance to the subject

>>2728102

could you estimate the distance?

>>2728102
>>2728104

obviously this is all rough estimates given you wouldnt be able to know precise details, what about distortion and such??

>>2728101
Yes, if the photo was taken with a measuring tape in the shot, or there was an item in the shot which you knew the size of and therefore could use as a measuring device

>>2728133

You guys are forgetting that this only works if no cropping has occurred.

>>2728101
>how would someone identify the lens used in a particular photograph of shot from a film
Ask the person that shot the picture.

>>2728101
Identify exact characteristics of lens (distortion, CA, transmissivity and all that).

Try to match against photograph.

You can write software for this, if you're skilled with that.