It's not supposed to. The manufacturer says Manual Focus only. Check out the compatibility chart for the Pentax version:
http://www.sigmaphoto.com/lenses/lenses_tele.asp#pentax CarlG -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of P. J. Alling Sent: 15. oktober 2007 14:06 To: Pentax-Discuss Mail List Subject: Re: Tele's It's a sigma with a sigma TC, (I know not helpful but you didn't ask for helpful only thoughts). David J Brooks wrote: > The last two times i have gone to use my Sigma 300 F 4 with its Sigma > 1.4 tele, i can't help but notice it does not seem to focus properly.I > can tell in the finder and on screen as well. > > I know the 300 focuses properly on its own, as i have the printed > results to show its still quite sharp. > > There does seem to be a very minor bit off play with the tele at the > lens mount and lens mount.Not much a mm or so. > > Could that be enough to make a wonky connection. > > I have not cleaned any connections, but they look OK.Both K10D and > PZ-1 showed these signs. > > Any thoughts. > > Dave > > -- Remember, it’s pillage then burn. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
