Advice please, Converter-autofocus? (1 Viewer)

[waxyplumer]

Hi,
Would using a 1.4x apo teleconverter affect the autofocus on a Sigma 120-400mm os hsm lens attached to a canon eos 550d DSLR?

Thanks in advance for any and all replies,

Mick.

 

[Huntso]

With the vast majority of TC's and Canon bodies you will lose AF once the aperture is above f5.6 (Except on Canon Series 1 models)

So if your lens is f5.6 which I suspect it is once the TC is added it will become f8 and AF will be lost on your 550D

 

[waxyplumer]

Huntso,
thanks for the quick reply and advice, much appreciated.

Cheers, Mick.

 

[Keith Reeder]

Might work if you tape the pins though - it's always worth a try.

 

[micloi]

Will work if you use the Kenko 1.4x DGX (either the MC4 or the PRO 300) if there is adequate light (on mine it works on 90% of the cases)