Re: A compromise for stills, but well-suited for videographers
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I'd like to add a note to my above review (it seems can't edit it afterwards):
I was interested in how the G81 (G85) RAW noise levels compare to the Canon EOS700D (technically identical to my 650D) and one from new Nikon D5600 since some of my colleagues praise Nikon cameras for their superior image quality. (No flame wars please!)
Sure, I'd compare apples with peaches... two APSC DSLRs with 3:2 image ratio against a m43 camera with 4:3 sensor. The EOS 700D from 2013 against two cameras from 2016. And yet, for me personally these three were competitors (owning two of them).
I downloaded three ISO800 test chart RAW images from dpreview and processed them with CameraRaw 9.10, as it gives me the best results of all RAW converters I have available and supports all cameras. I developed the unchanged image, a version with noise reduction set to a sensible 30 and one with +2EV overexposure and no NR to check dark areas.
The result is ...
The noise level is more or less identical to my naked eye on a full-sized image. The only difference is the resolution: 16MP (G81), 18MP (700D) and 24MP (D5600). Basically the 700D offering the same image height, but some more width than the G81.
What this imho means is that there isn't that much difference in high-ISO-performance between the G81/G85 and both APSC cameras from 2013 and 2016, the only visible gain of the D5600 being the additional resolution and the possibility to downscale the image in order to further reduce noise. But RAW-wise the G81 does keep up well against the two competitors with larger sensor. That soothes a lot.
What it also means is that if I complained about the image quality in my review, I was strongly influenced by my experiences with JPG images. In medium resolution they are usually very crisp - sometimes even a touch overprocessed showing stair artifacts, but it really is the noise reduction which can cripple images, most visibly when iContrast is on and the camera pushes dark areas such as needle-leaf forests in a landscape scene, smoothing away any detail.
I did not compare things like dynamic range, since the test chart images are not suitable for this.