Thanks for the tip, Ken!
(I've snipped the original message to keep this one short. Basically, Ken
Durling [EMAIL PROTECTED] combines a Tamron 1.4x TC and a EF 75-300
4-5.6 III USM, and finds that autofocus still works, though its not supposed
to!)
I've just tried it with my 300/4 L IS, and a Soligor 2x TC, on my eos 30
(elan 7e). Normally, with this TC, the camera reports F8 aperture (as it
should), and doesn't even try to autofocus.
So I've slipped a small piece of paper into the TC, over the first 3
electrical contacts *
Now the camera reports F4 again, and tries to autofocus.
Indoors (dark), it doesn't do very well. It locks on maybe 50% of time. This
is with only the center af point enabled.
With all the focussing points enabled, it locks on about 75% of the time.
But outdoors, in bright light, and with all focussing points enabled, it
locks on 100% of the time. It's slower than without the TC, and it does hunt
a little, but it locks on to anything that doesn't move too fast. So its
probably useless for sports, but it works great for slow or static subjects.
I've tried it with my old camera, an eos 50e, too. The 'paper trick' itself
works, but the autofocus pretty much fails to lock on to anything at all.
Martijn Stol
(* If your TC doesn't correct aperture, like Ken's, you don't need to do
this. If yours does, it's the 3 contacts that the lens side of the TC has,
but the camera side doesn't. You could try cello/sticky tape instead of a
piece of paper. Don't blame me if you damage anything.)
*
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