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.
Which Apple Watch model should you buy? Pick the best model, size, material, colour and strap for you with our Apple Watch buying guide 2017. We've got the full price list and all the buying options for the Apple Watch Series 1 and Apple Watch Series 2. by | 03 Jan 17.