Canon 2x Teleconverter

Provides 2 X image magnification at the cost of 2 f-stops of aperture. Some loss of image occurs even when used with L quality telephoto prime lenses. While the 2X can be used with “L” quality telephoto zooms (70-200 f2.8 and longer) we don’t really recommend it for the 100-400 Canon zoom or any 3rd party zoom. On non-1 series cameras use of a 2X teleconverter will require manual focus on any lens with an aperture greater than f2.8.

PLEASE NOTE: the Canon 2X will not fit on wide angle or standard zooms, wide angle primes or third-party lenses. For these you should use the Kenko 1.5X converter for Canon which will fit almost every lens.

Please note: Extenders are only available with rental of our telephoto lenses.

Roger’s take: There is no free lunch: if you could double the focal length of a lens with no downside for $250, then why wouldn’t they just build these in? 2X teleconverters are useful if you’re shooting “L” telephoto primes on a tripod, especially with a 1D series body.

They are going to give up 2 f-stops of aperture, making an f4 lens and f8 (that will probably be sharper stopped down to f11). On a non 1 series body, that’s not going to autofocus at all (or at least not at all accurately). On a zoom, they’re going to degrade image quality, although a few folks do shoot them on 70-200 f2.8 lenses with decent results.