Corner sharpness: Four Thirds vs 35mm (bandwidth warning)

Started Oct 27, 2007 | Discussions thread
fldspringer Senior Member • Posts: 1,427
Re: Effective f stops on 4/3rds

Charles Nguyen wrote:

With 4/3rd camera it's 2 stops slower than 35mm FF say at 50mm f1.4
you can have a Pan L1 25mm at f1.4 but in reality you're shooting at
f2.8. It's sort of fallacy when talking about fast 4/3rd lenses. Too
bad you don't have the exact focal lengths to compare between the 2
systems. I would like to see 28-70mm f2.8 L lens vs 14-54mm f2.8/3.5
Oly lens.

In reality, its just not the case. A 50 f1.4 is a 50 f1.4 and no more complicated than that. On 4/3, that lens has an angle of view approximating a 100mm lens on on a 35mm FF camera.

As far as DOF is concerned, it is still a 50 f1.4 and will behave like it. Nothing more complex than that.

The 35 ff at the same aperture collects 4 times the light, but that's because it has to. It has to expose 4 time the sensor area. The same light density per area for both systems and the same exposure time.

This DOF equiv thing is nothing of any value to my photography. Seems as no one outside of 35mm FF players seem to give it a second thought.

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