Post details: Canon 17-40mm f/4L USM vs Sigma 17-35mm f/2.8-4 EX DG Aspherical HSM vs Tamron SP AF17-35MM f/2.8-4 Di LD Aspherical (IF)


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Categories: Reviews

Canon 17-40mm f/4L USM vs Sigma 17-35mm f/2.8-4 EX DG Aspherical HSM vs Tamron SP AF17-35MM f/2.8-4 Di LD Aspherical (IF)


  Canon   Sigma   Tamron  
Focal Length






Aperture Max/Min f/4 f/4 f/2.8 f/4 f/2.8 f/4
Body Length 3.8" 9.7cm 3.4" 8.6cm 3.4" 8.6cm
Weight 1.1lb 500g 1.2lb 560g 1lb 440g
Filter Size






Min. Focus Distance 11" 28cm 10.6 27cm 12" 30cm
Price $679.95   $489.95   $479.95  

From left to right: Sigma 17-35mm EX DG HSM, Tamron 17-35mm DI, Canon 17-40L, Canon 16-35L

If you are after a high quality wide angle zoom (<17mm) for under $1000, you have three choices, the Canon 17-40, the Sigma 17-35 and the Tamron 17-35. Please note, the Sigma 17-35 reviewed is the latest EX DG version, NOT the older version as pictured by Amazon. The EX DG is a better lens than its predecessor and uses a smaller filter size (77mm) as well. If you are willing to go over $1000, there is the Canon 16-35mm f/2.8L, probably the best zoom lens in this range, coming top of the pack in all the samples. We added this one in since you might be interested in seeing what extra bucks might get you.

At the wide end, the Canon and the Tamron are neck in neck in terms of sharpness at all apertures. Up until f8, the Sigma lags behind. At the telephoto end, the Sigma leads followed by the Canon then the Tamron.

The 50% crops are arranged Canon, Sigma, Tamron horizontally and f4, f8 vertically. On the wide crops, the Sigma and Tamron also have f2.8 crops.

Tele crop Wide crop

Article updated with more crops and Canon 16-35mm f/2.8L:

Bokeh quality is a subjective issue, sample images are available.

Pros and Cons

- Pros
- Pros
- Pros
Good build

="2" face="Arial, Helvetica, sans-serif">Good build

and compact
Good image
Fast autofocus,
slightly slower than Canon
USM motor, silent, fast autofocus f2.8 available Good image
    f2.8 available
Cons Cons Cons
Expensive Slow autofocus Build
quality not as strong as Canon or Sigma
Soft at
17mm f2.8, f4

All three lenses have their strengths, but I would give my vote to the Tamron as the best balance of price and performance. The premium for Canon will get you slightly better build and fast and silent USM autofocus but I can't justify the extra $200. The Sigma has silent HSM autofocus but it is painfully slow and is behind the others in terms of image quality meaning too. We are most likely dropping Sigma from the recommended lens list.

What else to consider?
For $1400, you could also include the Canon 16-35 f2.8, the 17-40’s more expensive and faster bigger brother. As you can see from the samples, the 16-35 is an outstanding lens if you can afford it. It has sharpness to rival primes and is f/2.8 through its entire range. If you were to count 18mm as wide angle, you could add quite a few more lenses onto the list such as the Sigma 18-50 f2.8. As for lenses not on the recommended list, the Canon 17-85mm f/4-5.6 IS USM is a possibility but I would not consider the 17-85’s performance in the 17-35mm range on par with any of the lenses listed above.

Questions? Comments? To Mark please. - Lens Reviews

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