Typically a person has two stages of learning: lectures and experiencing. One phase is passive, depending on listening and remembering. The other phase depends on exploring, trying and failing.
When a question pops up on my team, they typically come to me, explain the situation, then I’d make a decision and it was implemented. This was great since everything was done _just_ the way I wanted. But then I noticed that the issues were getting smaller and smaller, and they kept coming to me for the answer. This won't scale.
The Sony A7 / A7R / A7S / A7II has become quite a popular camera in 2014 — a full frame mirrorless camera that’s about half the size of a DSLR full-frame. Another jewel in the A7’s crown is the ability to mount almost any lens, which (unfortunately) has increased the demand for manual-focus lenses significantly.