Crop Factor, Low Light and Aperture with m4/3 lenses?

Started Jun 15, 2014 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: A picture is worth...
3

Just another Canon shooter wrote:

Sergey_Green wrote:

Anders W wrote:

On the contrary, the dark tones cannot as a rule be "cleaned" without ill effects. Consider for example the hair of the girl in the example to which I link below.

http://www.dpreview.com/reviews/image-comparison?attr18=lowlight&attr13_0=oly_em1&attr13_1=sony_a7&attr13_2=sony_a7r&attr13_3=nikon_d800&attr15_0=raw&attr15_1=raw&attr15_2=raw&attr15_3=raw&attr16_0=3200&attr16_1=12800&attr16_2=12800&attr16_3=12800&normalization=print&widget=1&x=0.8342357734262059&y=0.2753099540100277

This comparison is not done with equivalent settings.

Yes it is. I compared ISO 3200 on MFT with ISO 12800 on FF, i.e., a two EV difference. This is what you need for the FF camera to reach the same DoF.

If you equate the total light (assuming the same scene lighting), things go back to their places.

I already equated total light. You didn't. You incorrectly compare ISO 3200 on MFT with ISO 6400 on FF.

The OM-D is slightly worse, detail vs. noise, like here, here and here, and maybe has some deep shadow advantage here to the A7 only but the A7 is more detailed. The 6D beats it every single time like here (can you read the text?), even in the deep shadows. In the greens (what DXO measures), it seems to be doing OK. This is in artificial light, and of course reflects the color filters, etc.

Even in the incorrect comparisons you provide, at a one- rather than two-stop ISO difference, the E-M1 beats the A7, A7r and D800 thanks to the greater efficiency of the smaller sensor. I didn't say that the efficiency advantage of the smaller sensor is more than one stop in comparison with any FF camera although for the above three it is.

So the real world results seem to show that the OM-D shows more noise vs. less detail, even in the deep shadows, with normal processing, at least (and no sane person will try to pull the shadows in those cases anyway).

See above.

Now, show me your calculations to prove me wrong.

I have already showed me your calculations and they, as well as what I said above, prove you wrong.

 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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