Canon 300/2.8 Tc Options

[Bill McCrystyn]

I need to know if a 300/2.8 will function in full AF mode (mounted on a 40D or the inevitable 12.2 MPX 1.6X 50D) when stacked with a 1.4 and a 2.0 TC? Does anyone have experience with that combo?

[D. Robert Franz]

Stacked converters did not work with he 30D on the 300mmf2.8L and I'm sure it will not on the 40D......