Autofocus with Sigma 500mm f/4.5 DG & Converters

Discussion

2 replies

Posted by Jeremy on October 11, 2008 at 9:34 AM

Hi,
I`ve just bought a Sigma 500mm f/4.5 DG lens from a forum member. Lens is great, but will not autofocus with my 40D and Kenko Pro 1.4x converter (with taped pins). My older non-DG Sigma autofocused very well with the 500 and TC.
Question is: Has anyone successfully achieved autofocus with this combination (Sigma 500 DG, Canon 40D, 1.4x converter)? And which converter did you use?
Thanks,

Posted by Dave Tucker on October 11, 2008 at 11:26 AM

Hi Jeremy, I also use the Sigma 500mm, unfortunatly you will have to use manual focus with the TCs, I have tried taping, rang Sigma....etc.

Dave

Posted by Michael John O' Ma on October 11, 2008 at 5:45 PM

Hi Jeremy,

You gave me advice on this a few months ago and I got it to work I am using a Canon 1.4x with taped pins.

Here is the thread
http://www.naturephotographers.net/imagecritique/bbs.cgi?a=vm&mr=29013&CGISESSID=5eae0f9e681b242d1eb890cb64cc716c&u=27636

MJ