Canon T4i Review

 
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Canon T4i Raw Comparison

We used to convert raw files used for comparison crops with dcraw (an excellent freeware raw converter), as we could count on dcraw not to apply any noise reduction, sharpening or other corrections. Lately, though, we've switched to Adobe Camera Raw with its noise reduction and sharpening options set to zero. We've found conversions made with recent versions of ACR to be almost identical to dcraw when dcraw's demosaicing option is set to match ACR's method, so we're pretty sure ACR isn't applying any noise reduction "under the hood" like it used to.

See crops below to compare the Canon T4i's raw image quality to its predecessor, as well as a few recent enthusiast models.

Canon T4i Raw Comparison with
Canon T3i, Nikon D7000, Pentax K-30 and Olympus E-M5
Raw files converted with ACR, no NR, no sharpening
Daylight-balanced illumination
Canon T4i
ISO 100
Canon T3i
ISO 100
Nikon D7000
ISO 100
Pentax K-30
ISO 100
Olympus E-M5

N/A,
ISO 100 not
supported.
Canon T4i
ISO 200
Canon T3i
ISO 200
Nikon D7000
ISO 200
Pentax K-30
ISO 200
Olympus E-M5
ISO 200
Canon T4i
ISO 400
Canon T3i
ISO 400
Nikon D7000
ISO 400
Pentax K-30
ISO 400
Olympus E-M5
ISO 400
Canon T4i
ISO 800
Canon T3i
ISO 800
Nikon D7000
ISO 800
Pentax K-30
ISO 800
Olympus E-M5
ISO 800
Canon T4i
ISO 1,600
Canon T3i
ISO 1,600
Nikon D7000
ISO 1,600
Pentax K-30
ISO 1,600
Olympus E-M5
ISO 1,600
Canon T4i
ISO 3,200
Canon T3i
ISO 3,200
Nikon D7000
ISO 3,200
Pentax K-30
ISO 3,200
Olympus E-M5
ISO 3,200
Canon T4i
ISO 6,400
Canon T3i
ISO 6,400
Nikon D7000
ISO 6,400
Pentax K-30
ISO 6,400
Olympus E-M5
ISO 6,400
Canon T4i
ISO 12,800
Canon T3i
ISO 12,800
Nikon D7000
ISO 12,800
Pentax K-30
ISO 12,800
Olympus E-M5
ISO 12,800
Canon T4i
ISO 25,600
Canon T3i
ISO 25,600
Nikon D7000
ISO 25,600
Pentax K-30
ISO 25,600
Olympus E-M5
ISO 25,600
N/A
ISO 25,600 not supported
N/A
ISO 25,600 not supported
N/A
ISO 25,600 not supported

Although the Nikon D7000 and Olympus E-M5 are a bit more expensive than the Canon T4i, we've included them here because they represent the best each company currently has to offer in the same class.

As you can see, the Canon T4i performs very similar to the T3i, though detail in the red leaf cloth isn't quite as good (something we also saw in camera JPEGs). The Canon T4i does well against the Nikon D7000 except for reds, and is just slightly noisier at very high ISO settings. The Pentax K-30 produces the cleanest output of the group, but it applies noise reduction to its raw files at ISOs above 1,600, something we'd rather not see. The T4i's performance is competitive with the Olympus E-M5's, perhaps just slightly noisier.

 

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