Taping pins

[mahleu]

I've heard a few people mention that you can tape a couple of pins on a teleconvertor which allows you to retain AF on lenses which wouldn't usually let you.

Which pins are taped and will it work with a sigma 2X teleconverter?

[Tim Gray]

I've heard a few people mention that you can tape a couple of pins on a teleconvertor which allows you to retain AF on lenses which wouldn't usually let you.

Which pins are taped and will it work with a sigma 2X teleconverter?
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first post has a picture.  don't know about sigma, but effectiveness will vary - ie in low light you may hunt forever without ever establishing a lock, particularly at 2x.

[mahleu]

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first post has a picture.  don't know about sigma, but effectiveness will vary - ie in low light you may hunt forever without ever establishing a lock, particularly at 2x.
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well at the moment it hunts forever and never focusses. With an F4 70-210mm it sometimes focusses, will have a play with the pins

[stever]

taping the 3 pins on the lens works on my 100-400 with 1.4x, but does not work on the 300 f4  with 2x  (20D)