Why does the Fuji 23/1.4 have the effective DOF of a 35/2.8?

Started 7 months ago | Discussions thread
Jim DT
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Re: Why does the Fuji 23/1.4 have the effective DOF of a 35/2.8?
In reply to DonSantos, 7 months ago

DonSantos wrote:

Mathematically/optically/physically, the 23/1.4 should have the effective DOF of around a 35/2.1 on a full-frame system.

But in practice, it seems to be closer to a 35/2.8.

Steve Huff did a quick comparison between the 23/1.4 on an X-E2 and the 35/2.8 on a Sony A7. They look virtually identical.

http://www.stevehuffphoto.com/2014/01/21/24-hours-with-the-fuji-x-e2-and-23-1-4-a-quick-review-by-steve-huff/

avanbeek/Andrew VanBeek did a comparison between the 23/1.4 on an X-E2 and the 35/1.4 on a Canon 5DIII. The 35/1.4 stopped down to f/2 on the 5DIII had substantially less DOF.

http://andrewvanbeek.com/fuji-x-lenses-and-full-frame/

So, why is this?

Anyone here have both the fuji 23mm and the sony 35mm and are willing to do some more comparisons for science?

Here's a roughly parallel comparison. On top, we have an X-E1 with a Leitz 35 mm f/2 Summicron, @ f/2 (M mount adaprot)

On the bottom, 5D MkII with Canon 50 mm f/1.8 @ f/2.8.

I normalized for pixel count by re-sizing the images such that the final picture should show up on a computer screen at about A4 size.

Please don't be rude about the total IQ. The Summicron is 40 years old and gets better stopped down a bit. And besides, it was so cold out there that I chose to work quickly

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