New member Erik from Sweden wrote:
> 2. What does IF mean?
Greeting, Erik, and welcome to the group with the best manners on the
internet, myself being the only exception. <s>
I'll only answer this one of your questions: IF means Internal Focusing,
meaning that focus is achieved by shifting internal elements and the
physical dimensions of the lens don't change as it focuses. Usually, this
indicates faster focusing time with AF cameras as well. It also indicates a
front element that doesn't rotate, useful to know if you use filters that
have to be oriented, such as polarizers or graduated filters.
--Mike
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