We’ll compare the Canon 24-70 f/2.8 Mk II, the Nikon 24-70 f/2.8 AF-S, and the Tamron 24-70 f/2.8 Di VC. This will largely examine the electro-mechanical mechanisms in the lenses. But just for completeness here are the optical diagrams for all 3. The Canon is the most optically complex, containing 18 elements in 13 groups.
3 days ago · Available in Canon, Nikon and Sony mounts, with the Canon version tested here, the Tamron SP 24-70mm f/2.8 Di VC USD costs around £1,000 (street price). Equivalent brand-name lenses are priced around £1,200 for Nikon, £1,000 for the Canon (Mark I), £2,300 for the new Canon Mark II and £1,450 for the Sony Carl Zeiss.

These are the best lenses made. Not wishing to spend that small fortune, here is a cheaper alternative and it is almost as good. Tokina AT-X 16-28mm f/2.8 Pro FX Lens for Canon. Tamron SP 24-70mm f/2.8 DI VC USD Lens for Canon. Tamron SP 70-200mm f/2.8 Di VC USD Zoom Lens for Canon.

The Tamron 17-70 F2.8 Di III-A VC RXD is a compact general-purpose lens for Sony's APS-C, E-mount mirrorless cameras. Think of it as roughly equivalent to a 24-105mm F4 lens on a full-frame camera, but scaled down to match the APS-C sensor format. Although it's designed for cameras with APS-C sensors, it can still be used with full-frame models
Cons. Strong vignetting at 24mm. Sharpness is merely decent. When it comes to pro-level zoom lenses, no focal length is more revered than the 24-70mm f/2.8. This venerable workhorse lens has been
Review by Klaus Schroiff, published June 2010 Special thanks to Johannes Matzke for providing this lens for testing! Introduction The Canon EF 24-70mm f/2.8 USM L is one of the more mainstream professional grade lenses in the Canon line up and very popular among pro (especially press) photographers as well as serious amateur.
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canon ef 24 70mm f 2.8 review