Designed to double the focal length of any compatible Canon EF lens, the Canon EF 2x II extender telephotoaccessory is ideal for sporting events and nature photography. The lens boasts a new seven-element design, along with the same weather-resistant and anti-reflective internal construction as the companion EF 1.4x II extender. More significantly, the extender supports autofocus with any EOS body provided the lens has an f/2.8 or faster maximum aperture (the EF 2x II reduces effective aperture by two stops). The EF 2x II--which also maintains an EOS camera's Image Stabilization technology--carries a one-year warranty.
I sat on this lens for about 2 weeks after I purchased it. Although the reviews I read were spectacular, I was somewhat afraid of being disappointed. Well,,,,,,,,,,,,,,,, I decided to test it this morning (7/4/16)............ I was blown away at the quality of images. I used this device with a Canon 70-200 II . At full maximum zoom, the pictures were still sharp. I am good with this purchase and anticipate happy experiences.
This is the magnifying factor of a lens. Macro lenses will often be described by their “magnification factor”. A lens with a 1:1 magnification factor produces a projected image on the sensor which is the same as the subject.
The individual pieces of glass that form the overall optical construction. Most lenses have between four and eleven elements to bend the light rays to ensure a perfectly formed image appears on the light sensitive surface, such as a film or CCD. The elements are arranged in groups and may be seen in specification sheets as, for example, 6 elements in 4 groups. That configuration may have two single elements and the other four grouped in pairs.