Rethinking 4/3 Depth Of Field

Started Apr 11, 2013 | Discussions thread
Anders W
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Re: I can already predict a response.
In reply to exdeejjjaaaa, Apr 11, 2013

exdeejjjaaaa wrote:

danijel973 wrote:

RoelHendrickx wrote:

I can already predict a response by some people likely to chime in here.

They will say that having shallow DOF at one's disposal is never a disadvantage, because if deeper DOF is desired, the aperture can always be stopped down a bit (while it cannot be "stopped up" to make the DOF more shallow than the lens wide-open on the sensor will allow).

Except when you stop down to have similar DoF you're no longer at f/2.8, you're at f/5.6, and then you push ISO up two stops to compensate for speed loss and suddenly you wonder where your "two stop advantage at high ISO" went.

except that in many cases you do not really need exactly the same DOF as you are forced in w/ m43/43 and then you do not need to push ISO 2 stops... so what you are saying is an artificial condition.

Sometimes you do need the extra DoF and sometimes you don't. The fact that you don't always need it doesn't make the OP's comparison irrelevant or artificial.

FF isn't always better. It is sometimes better, i.e., in those cases where DoF can be traded, without any disadvantage, for less noise. Currently, it is also better when you hit the lower ISO limit and therefore use a higher shutter speed with MFT than you really need. I hope/think that will change in the future and that we will soon see cameras with arbitrarily low base ISO appear.

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