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

Started Oct 23, 2013 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: It really depends which lens you compare with.

EarthQuake wrote:

Anders W wrote:

Raist3d wrote:

Comparing the standard zoom the difference isn't that big. Ditto for the F1.4 vs F1.8 prime.,487.393,ha,t

That the Panasonic lens here is one stop faster is irrelevant- you still get shorter DOF at will on the Sony by one stop (F4) and the sensor being bigger, you get at least 2 stops better ISO, so you can afford to have one stop less in that aperture. In fact, the Sony is still as a system faster light wise.

At least 2 stops better ISO?

A99 has light-robbing SLT. Check D600 and D800 performance if you want an idea how the A7 and A7R perform, as they are likely using the same (or better) sensors.

Perhaps not 2 stops, but 1.5 stops at least, which is quite significant.

Sure the A99 has SLT but that's not the whole story. Sony isn't Nikon when it comes to certain aspects of sensor performance, e.g., read noise, even if the basic sensor tech is sometimes the same. Go over to DxO and compare the DR curve for the entirely conventional (no SLT) A900 versus the D3X and you'll see what I mean. So it remains to be seen how Sony fares this time.

And, as you recognize, "at least 2 stops" is an exaggeration even in comparison with current Nikon FF. "At least 1.5 stops", as you claim, doesn't quite cut it either. At higher ISOs, it's more like 1.3 in terms of DR, sometimes even less.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +28 more
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