Photography Lens Extenders--A Note from Betty

Lens extenders offer optical performance and are a durable lens attachement for fast conversion of f-stops and focal lengths by attaching to preexisting lens.

One is Canon's Extender FD 2X-A for the telephoto lenses of 300mm or longer, doubling the focal length capability of the lens.

Here's Betty's note about extenders.

Matt, a friend of mine advised me what to buy knowing what I was looking for...mainly photographing wildlife, scenery. I have take the lens out twice and love it. It's heavy and expensive the major drawbacks.

Information about extenders my mentor sent to me.

The extender multiplies the lens focal length and f stop. Example is: A 2X doubles the lens effective focal, so a 70-200 mm f 2.8 becomes a 140-400 mm f 5.6 lens, of a 300mm f4 becomes a 600mm f8. If the extender is a 1.4 it multiplies by .4 and changes 1 f stop. Example: 70-200 f2.8 becomes a 100-280mm f 4.
Also, there are even a few 3X converters, which multiplies 3 times and add 3 stops. 70-200 2.8 becomes a 210-600 f 8 lens.

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