OMD E-M1 vs Sony A-7, What's the Difference?

Started Oct 23, 2013 | Discussions thread
larsbc Forum Pro • Posts: 15,160
Re: increased DOF

Michael Kaufman wrote:

Rob Sims wrote:

I'm not trolling here, but why is 'increased' DoF used so often as a positive? Surely you can just reduce you aperture size (don't most lenses go up to F22?)? Is it purely because you can get away with using a lower ISO at the same shutter speeds? Or am I missing something? Perhaps someone can kindly explain this one to me.

The idea is that in bright sunlight, you sometimes have to open your lens wider in order to get a correct exposure with your camera's maximum shutter speed. Sometimes doing this makes you DOF too narrow for whatever it is you are trying to take a picture of.

In this situation, a smaller sensor is an advantage because of its larger DOF at a given aperture.

You can add also a ND filter to fix this in the larger sensor, but you don't have to with the smaller sensor.

I think you might have things backwards.  Adding an ND filter will require you to open your aperture wider, thereby narrowing your DoF.

IMO the increased DoF argument applies more for low light scenarios.  The full-framers' retort, though, is that they can shoot at higher ISOs which means they can still use smaller apertures to get the same DoF as the m43 camera shooting wide open.

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