Tamron 24-70 f/2.8 VC review

Started Apr 23, 2012 | Discussions thread
Kreitmann Contributing Member • Posts: 621
Re: bokeh

The bad bokeh and the great sharpness are two sides of the same coin.

http://www.tamron.co.jp/en/lineup/a007/dimensions/index.html

Here you can see the diagram for the Tamron, lots of exotic glass. Note the 4 aspherical elements. These problably correct for the corner sharpness. The onion structures in OOF highlights are like a fingerprint of the none-spherical shape of these elements.

The old Canon on the other hand

http://www.canon.com/camera-museum/camera/lens/ef/data/standard_zoom/ef_24~70_28l_usm.html?p=2

only has to 2 aspherical elements and they are of higher quality, too

http://www.canon.com/camera-museum/tech/room/hikyu.html

Canon states a quality difference between a) ground and polished and b) molded glass aspherical lens elements. The 24-70L uses the better a variant, Tamron uses b) and a "hybrid" element, probably something like d) "a replica aspherical lens element, ultraviolet-light-hardening resin layer on a spherical glass lens element" in Canons terms.

My point is, it is very, very difficult to have a sharp, fast lens with good bokeh. Every lens is a compromise, for my, the not uber sharp wide open creaminess of the old 24-70 is great.

 Kreitmann's gear list:Kreitmann's gear list
Canon EOS 80D Canon EF 28mm f/1.8 USM Canon EF 85mm f/1.8 USM Canon EF 300mm f/4.0L IS USM Canon EF 24-70mm f/2.8L USM +12 more
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