24-105mm f4.0L with 2x extension?

Started Nov 20, 2008 | Discussions thread
Ken Phillips Forum Pro • Posts: 16,364
Some aftermarket 2x converters will work, BUT ...

At f/8 only EOS-1D series bodies will focus properly. (If the TC doesn't tell the camera it exists, all bodies will TRY to focus, with mixed results.)

Also, very few lenses, even really good lenses, hold up that well in front of a 2X converter ... a 1.4x seems to be the magic number.
KP

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