Oops ... my apologies... looks like I messed up while uploading the image, thanks for pointing it out ... I meant to load this one, made with the 16-35 f/2.8 L II, in December 2013Hey all,Welcome to CR.
Was looking for some insight on the aforementioned (in the subject) wide angle lenses. I shoot on a 5D Mark III, and am wondering if the f2.8 16-35mm is considerably sharper on the edges compared to the f4 17-40mm. I would be using the lens for primarily outdoor landscape use, but definitely would be used diversely. Any comparison of the two is appreciated.
At one point, I owned both lenses at the same time and sold the 17-40 f/4 in favor of 16-35 f/2.8 L II ... both are very capable lenses, but if money is not an issue, then get the 16-35 f/2.8 L II ... 1mm difference between 16mm and 17mm may not seem like a lot but there is a noticeble difference. I am sucker for "Sun star" effect and the 16-35 f/2.8 L II produces far superior "sun star" effect then the 17-40.
If you can try renting both the lenses and try this:
Point your camera at the sun and shoot with a small aperture, (e.g. f/16 or f/22). The diaphragm blades in the lens will create a star effect ... and you will see how pleasingly the 16-35 f/2.8 L II can create a sun start as opposed to the 17-40 f/4 (which to me looks lame in comparison) ... the same thing applies to street lights as well. Also note that at f/4 the 16-35 f/2.8 L II is sharper in the edges then the 17-40 f/4
Here is an image showing the "sun star" effect with the 16-35 f/2.8 L II lens.
Interesting, but that image you show canot possibly be shot with either of these lenses because they both do have seven blade apertures that produce 14 point starbursts. Your image shows 18 points, pointing to a nine blade aperture. Nine blade apertures don't exist in wide angle Canon EF zoom lenses so the lens used in this image is third party as well, or it was the new 24-70.
Image made with Canon 5D MK III + 16-35 f/2.8 L II, f/16, ISO 100, 1/800s
No problem there I bet you used your 24-70 Tamron for that image, am I correct?