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.
When does it go on sale? The Apple Watch goes on sale this Friday, September 25. The gadget first went on sale six months ago and hit shelves in the UK over three months ago. Finally the wait is over for Irish people and you can finally get your hands (and your wrist) on the watch this weekend. (Photo: Getty)