The Canon EF 200-400mm f/4L IS USM lens with built-in 1.4x teleconverter has been a wildly popular topic over the past year, with virtually everyone who has used it giving the lens nothing but praise. For a $12,000 lens, it seems to get around quite a bit.

It really shouldn’t come as much surprise that Canon may be leaning toward other optical formulas that use a built-in teleconverter. [Read more…]