G6 vs newest sensors: Real difference in high ISO noize

Started Mar 5, 2014 | Questions thread
Jacques Cornell
Jacques Cornell Veteran Member • Posts: 9,405
Test shots: G6 vs. GX7 noise

I recently bought both and thought I had a pretty good handle on the IQ differences. But, you folks made me curious, so I just did a series of test shots. My conclusion is that from ISO 800 up the GX7 has about a half-stop advantage. Below ISO 800, the differences are less apparent.

I shot RAWs of a ColorChecker Passport color reference card under tungsten light with camera on tripod at ISO 200 and from 800 up to max in 1/3-stop increments. WB was set in-camera at 2500K. Exposure was set to put the white patch at luminance 245. Depending on which color patch I look at, the GX7 is 1/3 or 2/3 stops better.

I did another test while I was at it, and the results are interesting and unexpected. I shot both at ISO 3200 and underexposed by 2 stops, then pushed the exposure 2 stops in Aperture. The GX7 picked up far less noise than the G6, giving it at least a 1-stop advantage.

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The 900-pixel crops below came from an image like this.

GX7 - ISO 6400

GX6 - ISO 6400

G6 - ISO 5000

G6 - ISO 4000

GX7 - ISO 3200 underexposed & pushed 2 stops

G6 - ISO 3200 underexposed & pushed 2 stops

 Jacques Cornell's gear list:Jacques Cornell's gear list
Panasonic Lumix DMC-GX7 Panasonic Lumix G Vario 7-14mm F4 ASPH Olympus M.Zuiko Digital 45mm F1.8 Olympus M.Zuiko Digital ED 12mm 1:2 Panasonic 12-35mm F2.8 +29 more
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