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 to buy it: Itâs easiest to buy AppleCare when you buy your new hardware, but you donât have to purchase it that way. For Macs, displays, iPods, and Apple TVs, you can buy an AppleCare Protection Plan at any time during the one-year warranty period. For iPhones, iPads, iPod touches, and iPod classics, you have just 30 days to decide if itâs worth it.