Canon EF 17-40 mm f/4.0L USM
3. Build quality
If we compare the Canon EF 17-40 mm with other verifocal lenses like the Tamron 17-50 mm or Sigma 18-50 and 17-70 mm, the results are not great, although the Canon has the weakest aperture. But when taking into the consideration the fact that the Canon was designed to achieve the ultra-wide field of view the large size can be excused. It is clearly seen in the Canon EF-S 10-22 mm. Both lenses (the 10-22 mm and 17-40 mm) seem to be very similar. They are both designed to achieve wide field of view with the first one using the APS-C detector and the second one the full frame. No wonder then that their construction, size and the way they look are very similar, as can be observed in the pictures below.
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In the middle of the Canon’s solid build we can find 12 lenses set up into 9 groups. It is worth adding that one of the elements was made of SUD low dispersion glass and three others are aspherical lenses. The lens includes a seven-blade diaphragm.
The whole construction of the lens allows the user to obtain high quality pictures from a distance of just 28 centimeters. Unfortunately, the size requires the usage of big filters, which, in Canon’s 17-40 mm case, needs to be a 77 mm filter. Since it would be a faux paux to use any filter with the L-grade lens, this pleasure would cost us a lot. As an example for the B+W UV filter of this size we would have to pay about 80$. Polarized and field filters would be even more expensive…
