I've been reviewing hardware and software, devising testing methodology and handed out buying advice for what seems like forever; I'm currently absorbed by computers and gaming hardware, but previously spent many years concentrating on cameras. I've also volunteered with a cat rescue for over 15 years doing adoptions, designing marketing materials, managing volunteers and, of course, photographing cats.
The camera produces clean JPEGs through ISO 800, but they all look a little soft.
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Noise and JPEG processing, mid-to-high ISO sensitivities
You can see the beginning of degradation in the details at ISO 1600, and by ISO 3200 everything starts to look overprocessed.
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Nikon D7100 vs. 70D, ISO 100
You can really see the difference the D7100's antialiasing-filter-free sensor makes for rendering more naturally sharp images. By ISO 1600, you can't do a lot with detail in the Canon's raw files, but the Nikon's still let you retain quite a bit of detail. (Nikon's default JPEG settings leave more color noise in the images than Canon's.)
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ISO 100 JPEG
Low ISO sensitivity shots look pretty typical for a consumer dSLR.
(1/125 sec, f5, evaluative metering, AWB, ISO 100, 18-135mm STM lens at 62mm)
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ISO 400 JPEG
ISO 400 shots look about as good as ISO 100 shots. This was also part of a burst at a relatively wide aperture, which the autofocus system handled well.
The contrasty exposures produced by the default Auto Picture Style can result in too many chipped shadows. I didn't make any adjustments to the raw image here. Sorry it's crooked, but that's partly from the relatively unusable -- especially in the dark -- level in the camera's viewfinder.
While I generally couldn't get decent results processing the raw files on ISO 6400 images, on this one I was able to at least get rid of the color noise and improve the detail a little.
Canon's default Auto Picture Style really abuses hues like these.
(1/60 sec, f4.5, evaluative metering, AWB, ISO 100, 18-135mm STM lens at 35mm)
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Color
By default, Canon boosts contrast and saturation just a little too much for my taste, though many folks will find the colors pleasing. You just have to watch out in low light, when the contrast boost can end up clipping more shadows than you'd like.
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Video, good light
In good light, the video looks pretty good. Like stills, it lacks sharpness, but that's also a function of the relatively low resolution of HD. You can see some ringing (halos) on high-contrast edges, but that's pretty typical.
Edges display various artifacts, notably aliasing, which become especially distracting in out-of-focus areas (look at the edge crawl on the terrace railing in upper left) and which become more pronounced as ISO sensitivity rises. This is pretty common as well, though.