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.
Autofocus vs. Manual Focus. The majority of lenses being manufactured today are capable of being used in either autofocus or manual focus mode. Canon does not make a single lens for their DSLR cameras that isnât capable of both. This wasnât always the case. Before Canon helped pioneer autofocus systems, it produced all-manual-focus FD lenses.