Quote - > Quote - Rightio.  But suppose I want to set my focal length to something close to the human eye, 100mm, for example?

I'll have to take some photos out of my window when there are some interesting clouds, just to show you what I mean.  I know, a picture is worth a thousand words and all that. 

The human eye is 50 mm. And Poser's focal length is wrong by a factor of 1.4. To accomplish a human eye type of field of view, you want 50 / 1.4 = 35 HAHAHAH.

Just stumbled across this. Where does the sqrt(2) come into it? I.e., what is the source of the error?

Whichway