CANON Extender EF 1.4x II Teleconverter lens

CANON Extender EF 1.4x II - Product Details 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 Serieslense (...) See more See less

s (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 1.4xx 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 yes, IS still functions normally. A Canon EF 70-200mm f/4.0 L IS Lens mounted over a 1.4x becomes a 98-280mm f/5.6 lens. A Canon EF 300mm f/2.8 L IS Lensbecomes 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. Do you need more macro magnification from your Canon EF 180mm f/3.5 L IS Lens? Add the Canon EF 1.4x II Extender to the setup for a 252mm 1.4:1 Macro lens. Because the Canon EF 1.4x II Extender is multiplying the aberrations/flaws of the lens it is mounted behind by 1.4x, there will be some degradation in image quality when using the 1.4x. Sharpness (especially in the corners) and contrast are modestly reduced - stopping down shows lens degradation. However, barrel distortion causes the center portion of the image to be slightly enlarged - making it appear to resolve more detail. Additional CA (Chromatic Aberration) is introduced, but vignetting is somewhat reduced (only using the center of the image). The best 1.4x results will be made using a very sharp lens such as the Canon EF 70-200mm f/2.8 L IS Lens Another negative aspect to shooting with the Canon EF 1.4x II Extender attached is the resulting reduction in autofocus speed. This can be an issue if you are shooting in low light and/or are using a lens th (Description excerpted from: My Cameras 2006)