The Canon EF lens mount was first
announced in 1987 and subsequently turned into the prevailing mount for the entire Canon EOS
line both SLR film and DSLR digital cameras. The acronym EF means "Electro-Focus": EF lens auto focusing is conducted by an in-the-lens dedicated electric motor. From a mechanical standpoint it' a bayonet-type mount, and all data transmission between lens and camera occurs by electrical contact; there is no mechanical interaction
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Canon established the EF-S mount in 2003, an offshoot of the Canon EF mount created strictly for 1.6x crop factor digital EOS cameras. Although an EF lens may be mounted on an EF-S cropped image body, an EF-S lens cannot be fitted to an EF body. An EF-M Lens Mount Adapter from canon allows you to attach EF & EF-S Canon lenses to the digital Canon EOS-M mirrorless camera, which features a Canon EF-M
lens mount. It operates fully with every lens function, including autofocus and
STM stands for Stepper Motor and is a applied to a new range of Canon lenses which feature a new design of focus motors which, along with a new iris mechanism are designed to eliminate (auditory) noise during video
Professional Zooms Compared to Primes
Although a f/2.8 zoom lens for professionals is 4 times faser
than an f5.6 zoom for consumers, a f/1.4 prime is 4 times faster
than an f/2.8 zoom..
Proficient photographers need to re-think using a fast prime lens. Probie shooters first acquire some experience with a entry level prime and zoom lenses, to allow them to choose if they want to employ f/2.8 zooms or f/1.4 primes.
The top performing lenses are
primes, and not
zooms, although there are some excellent zooms. Also rated highly are
Jan 31, 2011
Macro Lenses bring small things into full-sized view, select from one of the lenses in this category. Macro lenses can uncover detail that would be impossible to detect by the eye and give new perspective to extremely minute subjects such as insects or the petals of a small flower.
A brand new new book about
Canon Lenses includes all the variations - is a new paradigm in publishing,
Disparate content sources have been organized into a single relevant, cohesive
and informative book. This content was organized using articles from Wikipedia
and images using Creative Commons licensing, Books like this one represent an
exciting new lexicon in the distribution of human knowledge. This book in
particular embraces chapters focused upon the various Canon lenses, including EF-S
lenses, EF lenses, FD lenses, kit lenses, FL lenses, and L-Series lenses.
An offshoot of the EF mounting system, Canon added the EF-S lens support, in 2003, designed only for EOS digital cameras featuring a 1.6x crop produced after 2003. Any other Canon EOS camera that features an EF mount only will not permit mounting of EF-S lenses.
Tilt Shift - These lenses expand photographic possibilities. Tilt movements allow you to obtain a wide depth of field even at the maximum aperture and still keep the entire subject in focus. Shift movements correct the trapezoidal effect seen in pictures taken of tall objects, so as not to distort the subject.
Ultrasonic Motor. Ring. USM motors are silent and manual focus (FTM = Full Time Manual) is possible without switching out of autofocus. Micro USM motors are quiet, but do not allow full time manual focus.