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.
Apple's starting price is $299, but Best Buy currently has the Watch Sport starting at $249. Best Buy has the Apple Watch Sport (38mm) for $249 and the Sport (42mm) for $299 -- a full $100 less than the previous retail price. Target appears to be offering the same pricing, though at this writing, all the models are showing not available for both shipping and in-store pickup.