Is this photo taken with a 50mm or a 100mm prime ?

MattKing

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There really is no way to tell.
The depth of field is shallow, so the aperture is probably large.
There are signs of it being shot from a distance - the relatively flat perspective - but the result can be achieved with a bunch of combinations of film/sensor size, lens focal length and image cropping.
If you take two photos from the same distance - one using a 100 mm lens and the other using a 50 mm lens - and then crop the results from the 50 mm lens to match the two frames, the results will be essentially the same.
You can do the same thing with a zoom lens that covers the same range.
 

grain elevator

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Looks wider than 50 to me. Notice how enlarged the ear is? The photographer was close, uncomfortably so. Strange website. Very odd way of presenting a dialogue.
 

Athiril

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This looks perfectly reasonable for 50mm to me. 50mm does require you to get close up for a close up like that.
 

Athiril

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George Mann said:
I thought so too until I noticed the large depth of field behind him.
Click to expand...
You mean thin DoF? That looks like DoF from a 50mm lens close up still. Even at f/2.8 it is that thin when you focus that close.
 

David A. Goldfarb

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grain elevator said:
Notice how enlarged the ear is? The photographer was close, uncomfortably so. Strange website. Very odd way of presenting a dialogue.
Click to expand...

That would seem to be the message of the page. He’s a therapist. “Need someone to talk to? This guy’s your ear.”
 

Cholentpot

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Cellphone cropped down. Out of focus is created using algorithm from phone software.
 

wiltw

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grain elevator said:
Looks wider than 50 to me. Notice how enlarged the ear is? The photographer was close, uncomfortably so. Strange website. Very odd way of presenting a dialogue.
Click to expand...

I agree...WA FL

I just taped three parallel lines on the wall, and photographed the convergence see with a target about 3' awy, using 28mm FL (actually 17mm on APS-C body)
The resultant convergence of lines was similar to what was seen in the linked photo...lines converged to about 1/3 width of short dimension frame in 3'.

 
Last edited:

grain elevator

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Yup. The intercept theorem can also be useful. The ear is around 30% enlarged, compared to the nose (the ear is about as long as tip of nose to eyebrows, not a lot of deviation). Let's say the distance between ear plane and nose plane is about 12 cm. Then this distance is also 30% of the distance nose - nodal point of lens. Film plane would be under 40 cm from the ear. This is conservatively estimated I'd say. At this distance, a 50 wouldn't get everything in the picture that's in it. Calculate it or try it.
 
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