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.
Nikon F and Canon EF Mount Size Differences. Another key difference is the physical mount size â Nikon F mountâs âthroatâ diameter is 44mm, whereas the Canon EF mount is larger at 54mm. That 10mm difference might seem small, but it is actually quite important when it comes to lens design.