Rotator cuff injuries cause pain in your shoulder and upper arm. The pain may be most noticeable when you reach up or out. When you turn your arm as you lift it, the tendons are more likely to rub against surrounding structures.
The essential difference between the original series of AF Nikkor lenses and all AF lens types introduced subsequently, from the AF-D versions onwards (see below), concerns the compatibility of a particular lens with Nikon's enhanced Matrix metering system known as 3D Matrix metering that was introduced during 1996.
I've never been let down by a Canon L lens. I've also never been let down by a Nikon lens. However that doesn't mean you won't get similar results from a non L counterpart. A few of my favourite non L Canon lenses are the EF 50mm f/1.4 USM Standard, a Canon EF 85mm f/1.8 USM and a Canon EF 70-300mm f/4-5.6 IS USM Lens.any professionals will own both Canon and Nikon cameras over the lifetime of their career for many different reasons. Personally I recommend buying whatever camera brand has the best price special at the time of purchasing.