> Uprzedziłem go o skutkach ale chce tak czy siak.
> Tylko nie wiem czy C cos takiego w ogóle produkuje :/
produkuje ale nie do takiego szkla.

ze strony canona:
"Extender is Canon's name for a teleconverter. These high-performance
accessories multiply the effective focal length of an attached lens by 1.4x
or 2x. For example, a 200mm lens with Extender 1.4x has an effective focal
length of 280mm: with the Extender 2x, this increases to 400mm. Extenders
are only compatible with selected EF lenses, including the EF 70-200mm
f/2.8L USM, EF 70-200mm f/2.8L IS USM, EF 70-200mm f/4L, EF 100-400mm
f/4.5-5.6L USM, EF 400mm f/4 DO IS USM and fixed length L-series lenses of
135mm or higher."

c.