Continuation: Sensor Size, Present & Possibilities

Started Apr 10, 2013 | Discussions thread
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Re: On DOF
In reply to EinsteinsGhost, Apr 11, 2013

EinsteinsGhost wrote:

That is comparable to 50mm f/2.8 on FF. And that takes us to another issue. Stopping down can sometimes necessitate higher ISO which would take away, most if not all, DR and noise advantage of FF.

No, not "most"; "All or worse". Photo sensors, you see, are easier to design and manufacture the smaller they are, so for sensors of equivalent generations and given constant DOF, the smaller one will be at least as good, but likely better in proportion to the difference in sensor size.

In other words, if you compared your smartphone and your SLR at equivalent DOF and shutter speed, raising the ISO to compensate, the smartphone would cream your puny SLR; which makes it a good thing that the ultra-deep DOF of a typical smartphone generally isn't needed and you can use your SLR lens at apertures and ISO ratings it's actually decent at.

Thus, the sane solution is to find a format for which DOF seems sufficient at normal aperture ranges, instead of buying the biggest one you can afford then stopping down further. It not only makes a considerable amount of financial sense, given the exponential rate at which camera prices rise with sensor size, file quality in the end will almost surely be superior as well. For you it seems to be APS-C, for others it'll be 35mm, and for me... well, I strongly suspect it's 1", but given the limitations of existing cameras, I'm trying to decide whether m43 or 2/3" might be better. One thing's for sure, though: I'm in no hurry to return to 35mm, and the DOF of a 50mm f/1.4 wide open is one of the main reasons for that.

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