Thread: Teleconverters
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Old May 4th 07, 02:19 PM posted to rec.photo.digital.slr-systems
John Sheehy
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Posts: 878
Default Teleconverters

Gautam Majumdar wrote in
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On Thu, 03 May 2007 23:13:45 +0100, Charles wrote:

Hi all:

Thinking about this combo:

20D, EF 100-400 and EF 1.4XII teleconverter.

You will lose AF with any 10 pin TC. I use a Kenco non-Pro 1.4x TC
(7-pin) which allows AF. Quality is not bad at all. It is half the
price of Canon.


I don't even like the AF of the 100-400 without a TC; I can't imagine
relying on it *with* a TC.

The AF switch has been off for a long time on my 100-400.

Learn to focus manually, IMO. There are too many wrong things for AF to
focus in in telephoto work, unless you are shooting things that are
isolated from the background.

There is nothing more frustrating than AF that was just spot-on hunting the
wrong way or focusing on the wrong thing while your photo-op ends.

--


John P Sheehy