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.
The Differences Between Sigma's 150-600mm OS Sports and Contemporary Lenses. I'm deep into reviews of the Sigma 150-600mm f/5-6.3 DG OS HSM Sports and Contemporary lenses. While their names differ by only one word and their image quality appears very similar, these two lenses are dissimilar in many ways. Here is my list so far: Sports lens is nearly 2x more expensive.