Canon Extender 2x (Quality)

[CH47D]

Fellow Photographers ,

I have been using with great result the Canon 100-400 EF lens , for some of the movements at the airport i found out that 400 mm max isn't enough and came across the Canon Extender (2x) because the 2x is roughly USD $ 375 here in the U.S. before i purchase this extender is there anybody out-there that has any experience (good or bad) with this product combined with the 100-400. If possible any examples with the extender. Would like to see if 200-800 will be the solution.

Thanks ahead for posting

Cheers

[SpotterNL]

Keep in mind that you will not have autofocus anymore (without tricks) and image quality degrades seriously. The 2x is really only meant for the 300 f/2.8, 400 f/2.8 etc.

[CH47D]

Thanks for the tip , will probaly get 1.4x rather than 2x since i need the auto-focus function and 2x hasn't got that.

[SquAdmin]

Unless you own an EOS1D or EOS5D you will also loose autofocus if you combine 100-400 with 1.4TC...

[bramos]

You'll lose AF on the 5D as well, only the 1D(s) can cope with F8 as maximum aperture. All the other cams need F5.6.

f/8 cameras are the EOS 3 and 1V film cameras, and the EOS 1 series digital cameras. All other EOS models are f/5.6 cameras.

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[CH47D]

Thanks for the reply i am using an EF100-400mm f/4.5-5.6L IS on a Rebel T1 so i better not be getting either one because the autofocus is not functional on the T1 model. I probaly rent a Canon 500mm for a day or two to get those airborne shots at i.e. Marana , thanks for the advise it has saved me a few bucks.