Canon Extender EF 1.4x II

Pristine condition  

The Canon EF 1.4x II Extender is an easy and very affordable way to noticeably extend the reach (focal length) of compatible Canon L Series lenses (and a few additional lenses).  

The Canon EF 1.4x II Extender mounts between the compatible lens and body, and multiplies the focal length settings of your lens by 1.4x. That's the good news - the bad news is the 1.4x decreases/narrows your lens' aperture setting by 1 stop. The lens aperture still opens to the same width, but the ratio of the aperture opening to the focal length is reduced - by 1 stop.   For example, the Canon 1.4x makes a Canon EF 70-200mm f/2.8 L IS Lens into a 98-280mm f/4 IS lens - and IS still functions normally. A Canon EF 70-200mm f/4.0 L Lens mounted over a 1.4x becomes a 98-280mm f/5.6 lens. A Canon EF 300mm f/2.8 L IS Lens becomes a 420mm f/4 IS lens.  

Extenders do not affect the MFD (Minimum Focus Distance) of the lens they are mounted behind, thus the MM (Maximum Magnification) of the lens is also multiplied by 1.4x.   

Though most compatible lenses have widest apertures of at least f/4, some of the longer ones have an f/5.6 native maximum aperture. Since most non-1-Series Canon camera bodies need a minimum wide open aperture setting of f/5.6 for autofocus to work, only Canon 1-Series camera bodies will autofocus these f/8 1.4x combinations. The Canon EOS 1D X also requires f/5.6.

The lens and extender combo can always be used in manual focus mode. A narrow maximum wide aperture creates a dark viewfinder that makes manual focusing even harder.  

The Canon EF 1.4x II Extender is small and light. It is weather-sealed when used with similarly-sealed lenses and camera bodies. Build quality is excellent - Canon L Lens quality.

http://www.the-digital-picture.com/Reviews/Canon-Extender-EF-1.4x-II-Tele-Converter-Review.aspx     

 

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