teleconverter

Strange: Canon’s 70-300mm L Lens Can Be Shoehorned into the 1.4x Extender

Canon released a new firmware update for the 1D X this morning that gives the DSLR cross-type autofocus when using certain telephoto and extender combos that have a max aperture of f/8. The announcement page includes a list of lens/extender combinations that are now compatible.

The first lens listed in the 1.4x Extender column is the "Canon EF 70-300mm f/4.5-5.6L IS USM." Problem is, that's not a lens that exists...

Nikon and Tamron Patent Teleconverters with Built-In Image Stabilization

 
Canon might be rolling out a new Image Stabilized lens with a built-in teleconverter, but Tamron and Nikon seem to have image-stabilization/vibration-reduction tricks up their sleeve as well. Apparently in the early 2000s both Nikon and Tamron filed patents for teleconverters with image stabilization baked right in. Tamron's was for a standard unit that sits between the lens and the camera body, while Nikon's was for a unit that sits in front of the lens.