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.
Best Apple Watch straps: Third party bands to pimp your watch for less. There's nothing that changes any watch's look like a new strap or band, and even the Apple Watch can be given a dramatic makeover with a little customisation. Like most Apple Watch owners you've probably coveted the official straps, and most likely balked at the price. But there are tonnes of third party bands for sale now, and the good news is they're far cheaper than the official ones.