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...

Just another Canon shooter wrote:

Anders W wrote:

I need to correct myself here.

I looked at the SS and the apertures again (ISO is irrelevant), and the total light is the same in the original link.

Good that you have eventually recognized that.

Yeah but I did not do it based on the ISO.

The error you made was to set the ISO for FF too low relative to MFT in the comparison, right?

Where the efficiency difference is most noticeable depends on the individual sensor. For some FF sensors (e.g., A7, A7r, and D800) the efficiency difference is large at higher ISOs but small at lower. For the Canon 6D, it is the other way around. The 6D has worse DR at base ISO than the E-M1 (12.1 versus 12.7), not two EV better as would be expected if the sensors were equally efficient.

That is by your definition of efficiency.

This is based on the fact that the signal-noise performance in the dark tones is of greater perceptual importance than the signal-noise performance in the brighter tones. Both the 6D and the E-M1 will do perfectly well in every regard at base ISO as long as you don't push the shadows. If you do, the E-M1 will do better.

The 0.6 EV difference in DR is relevant only in some situations but the 6D/800D can still record 4x more light and have much better tonality because of the lower shot noise at base ISO. Canon has different color filters than most brands, so that tonality varies from color to color (Nikon/Sony/Oly do better in the blue colors, for example).

See above.

 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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