Application: sports, nature, heavy and not cheap, which does not allow the lens to move apart into the "trunk" the weight of the lens will not have a very positive effect on the bayonet, it is very useful to use a monopod.
Nikon 50mm f/1.8D Lens: Perfect for Nikon DSLR Cameras!
97 Review
Canon EF 50mm f/1.8 II Fixed Lens - Discontinued by Manufacturer
93 Review
Nikon 35mm f/1.8G Auto Focus Lens for Nikon DSLR Cameras - Black (Model 2183)
125 Review
Canon EOS SLR Camera Lens EF 24-105mm f/4 L IS USM
124 Review