“Spec” is short for “speculative,” and “spec work” is defined by the AIGA (which counts many photographers as members) as, “work done prior to engagement with a client in anticipation of being paid.”
This is the classical definition, and it began in the creative industries, where a photographer would shoot images for a desired client and then show them the work in the hopes of being hired. Notice the very important distinction: the work was done BEFORE contact with the potential client. This “free” spec work was not solicited or negotiated.
Canon’s new 1D X is an impressive fusion of the old 1D and 1Ds lines, boasting state of the art sensor quality combined with impressive speed, but there’s one downside that may be a big disappointment to some photographers: the camera loses autofocus when used with lenses with a max aperture of f/8.
While there aren’t any Canon lenses that naturally have an f/8 maximum, adding a 1.4x extender to a f/5.6 lens or a 2x extender to a f/4 lens results in a lens with a max of f/8. If you’re planning on upgrading to a 1D X but need extended reach (e.g. you do bird photography), you may need to shell out some extra cash for a faster lens.
(via Arthur Morris via The Digital Picture)