Potential dead horse: how bad is FF's deep DoF disadvantage?

Started Mar 5, 2014 | Discussions thread
EinsteinsGhost Forum Pro • Posts: 11,977
Re: Let's try to simplify this.

I was only attempting to point out that the supposed FF advantage in narrow DOF  can be a double edged sword. There are instances when a photographer will want more DOF and compared to 4/3 will have to stop down two stops, with a given shutter speed this will necessitate raising the ISO two stops for the FF camera vis a vis the 4/3 camera. Whether current FF cameras will have a 2 stop advantage over 4/3 (or, rather m4/3) at a given ISO is open to debate.

Smaller sensor cameras have the potential to close the gap with FF given lenses that are fast and sharp enough for the task. This is a real challenge to the optical engineers, no doubt, but is that not  how 35mm film became the dominant format in competition with larger formats?

Actually, you picked only one side of the argument. I covered the other side which is where larger sensor shines. You get better DOF control with larger sensor without changing the perspective and FOV. In fact, I dealt with an identical situation (wanted words in the background to be readable) while trying Sony a7 with 55/1.8. I shot at f/5.6 instead of 2.8 I used for most part but needed ISO increase by only one stop (since there was ample room at base ISO).

For the next shots, I was able to be more selective about the background blur with the same lens.

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