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 Series 2 is available from September 16, and in terms of pricing it unsurprisingly arrives at a variety of levels, with the cheapest model, the 38mm version, coming in at $369 in the US, Â£369 in the UK and AU$529 in Australia.