Thus, if your teleconverter provides a magnification factor of M (where M may be 1.4, 1.7, 2, etc.), and your lens has a focal length of F and an f-number of N, then the result of attaching the TC to the lens is to produce an effective focal length of M Ã F and an f-number of M Ã N.
Those on the hunt for an Apple Watch can find them online and in the Apple Store, Best Buy, Target and B&H Photo and Electronics in New York City. For those on a shopping mission, here are the five big things to watch for that can affect your bank account.
The Apple Watch will start shipping in April, Apple CEO Tim Cook said during a call with investors and analysts on Tuesday. First announced in Sept. 2014, the Apple Watch will come in three different styles, the most expensive of which will be covered in 18-karat gold. The watch will connect to the iPhone, and start at $349.