Rethinking 4/3 Depth Of Field

Started Apr 11, 2013 | Discussions thread
Great Bustard Forum Pro • Posts: 42,575
Re: Rethinking 4/3 Depth Of Field

ultimitsu wrote:

al_in_philly wrote:

Of course, I could shoot FF at 2.8, but then I'd also be shooting at an ISO of 12800 for the same shutter speed.

No, that is not the correct. At F1.4 all digital cameras lose about 40% of light. F1.2 lose about 50% and F1.8 loses about 10%. See DXO's F-stop blues article for more detail.  So for the same shot at the same SS, FF shoot at F2.8 would only need ISO 7000, rather than 12800.

The light loss is generally only an issue for f-ratios below f/2, and is a direct result of the efficiency of the microlens covering.  DxOMark's article did not measure mFT sensors, nor have they measured the latest generation of sensors.  In other words, today's micolenses may be more efficient than the last generation.

Even as good as FF images are, the OM-D at 1/4 the ISO will always look better.

These is no basis for this claim.  OMD does not use alien technology, it uses a Sony sensor, which sports the same technology as D600, D800, A99 and RX1. so if its sensor size is 1/4, then at 1/4 iso it will look exactly the same IQ wise.

It has less read noise / area at high ISOs than most FF DSLRs (the Canon 6D, however, matches it), and the same QE, which puts it slightly ahead of most FF DSLRs for Equivalent photos.

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