Tamron 24-70mm f/2.8 VC vs Canon 24-105mm f/4L IS tested at 24-70

Started May 11, 2012 | Discussions thread
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Moosemilk
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Tamron 24-70mm f/2.8 VC vs Canon 24-105mm f/4L IS tested at 24-70
May 11, 2012

I did a quick comparison of the Tamron 24-70mm f/2.8 VC and Canon 24-105mm f/4L IS at 24-70mm on my 5D Mk III to determine how sharp each is in the center and in one corner. The results are below and at http://www.larsparonen.com/2012/05/10/tamron-sp-24-70mm-f2-8-di-vc-usd-vs-canon-ef-24-105mm-f4l-is-usm/

I also compared the Tamron at f/2.8 to f/4 at 24mm.

All shots were taken with my Canon 5D Mk III mounted on a tripod, which did not move. Camera settings were constant, except for the shutter speed, which was set manually according to what was needed to get a proper exposure using the camera's evaluative metering. Vibration control and image stabilization were set to “off”. Focus was set to “AF”. Image quality was set to “RAW”.

The short of it is that I'm pleased by how the Tamron performs. Although I've read reports of variations, the good copy/bad copy ratio has yet to be credibly established. Tamron may have a winner here.

Apart from the results, the test seemed to confirm other reports that one or both of the lenses don't conform to the focal lengths stated across the 24-70mm range.

Also, the Tamron let in a bit more light at f4 at all the focal lengths tested.

The first set of pics compares the center sharpness of the Tamron SP 24-70mm f/2.8 DI VC USD. The second set of combo pics reveals how sharp the lenses are in the upper-left corner of the images.

The results:

Center of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD at f/2.8 and f/4 at 24mm:

Center of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD and the Canon EF 24-105mm f/4L IS USM at 24mm:

Center of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD and the Canon EF 24-105mm f/4L IS USM at 50mm:

Center of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD and the Canon EF 24-105mm f/4L IS USM at 70mm:

Corner of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD at f/2.8 and f/4 at 24mm:

Corner of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD and the Canon EF 24-105mm f/4L IS USM at 24mm:

Corner of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD and the Canon EF 24-105mm f/4L IS USM at 50mm:

Corner of photo as captured with the Tamron SP 24-70mm f/2.8 DI VC USD and the Canon EF 24-105mm f/4L IS USM at 70mm:

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