Continuation: Sensor Size, Present & Possibilities

Started Apr 10, 2013 | Discussions thread
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Re: On DOF
In reply to olliess, Apr 10, 2013

olliess wrote:

EinsteinsGhost wrote:

There is no need for that. This was taken with NEX-3 and 35mm f/1.8 lens (wide open):

Why exactly would you need 50mm f/1.4 on FF?

A) To increase the subject isolation while keeping the same subject-background distance

B) To keep the same subject isolation while decreasing subject-background distance

C) To increase the exposure to reduce noise

D) To increase the shutter speed in case the subject suddenly jumps at the camera.

Do we need to continue?

You didn't use an objective analysis, but went with a theoretical one. Have you never encountered a situation where your DoF is too shallow for good isolation? With my APS-C bodies, I see that often and feel the need to stop down to have sufficient DoF. After all, I wouldn't want portraits with eyes in sharp focus but blurred out nose.

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