What does a 2x extender on a lens do?
The 1.4x Extender causes a decrease of one stop in the maximum aperture of the lens, while the 2x Extender causes a loss of two stops. This means you gain extra focal length at the expense of losing some light.
Are lens extenders any good?
While teleconverters give you decent image quality, they still cause the photos to lose some of it. However, they are still much better than cropping the image, and they preserve way more quality than cropping. This probably goes without saying, bit when you’re using a longer lens, there’s more camera shake.
Is a lens extender worth it?
What lenses are compatible with the Extender EF 2x III?
This lens is only compatible with fixed focal length L-series lenses 135mm and over, as well as the EF 70-200/2.8L, EF 70-200/2.8L IS, EF 70-200/4L, and EF 100-400/4.5-5.6L. Additionally, please see the lens and/or camera body manual for full compatibility information with the Extender EF 2X III.
Why does the Canon EF 2x III Extender have lower image quality?
Because the Canon EF 2x III Extender is multiplying the aberrations/flaws of the lens it is mounted behind by 2x and because there are now 9 additional lenses for light to pass through, reduced image quality should be expected.
What are the benefits of the canon is Series III extenders?
A microcomputer integrated into the Series III Extenders promises faster autofocusing and increased AF precision when used with the Canon IS Supertelephoto Series II lenses mentioned above and (I expect) all future compatible lenses. Better optical quality is also expected.
What is the max aperture of the Canon Extender lenses?
Some of the extender-compatible lenses start with an f/5.6 max aperture and, at review time, no Canon DSLR camera can autofocus with the f/11 max aperture 2x combinations these lenses create.