> Has anybody used > the Sigma 300/4 with an AF x1.4 teleconverter, and if yes, then > which one and how well does the AF work ?
Yes used the Sigma 300 f/4 with the Sigma EX 1.4x TC and it worked very well, focusing was quite quick considering the focal length, the Sigma comes equipped with a limit switch which helps. The Sigma is an internal focusing lens and the focal length changes with the focused distance, at infinity (according to reports) it is 326mm making it 456mm with the 1.4x TC. 450mm f/5.6 John ---------- Original Message ----------- From: "Jim Colwell" <[EMAIL PROTECTED]> To: "pdml" <[EMAIL PROTECTED]> Sent: Tue, 14 Sep 2004 06:54:54 -0300 Subject: Re: wide-only-and wide-to-normal zooms (and ultra-long primes) > Thanks to all for your comments on AF 400mm lenses. > > I hadn't thought of using a teleconverter on a 300/4. Maybe I > should also consider a FA-200/2.8 with a x2 teleconverter. I have a > Pentax Rear Converter-A 2X-S, and rarely use it (OTOH, I use the > 1.4X-L and 2X-L on my SMCP 500/4.5 quite often). Has anybody used > the Sigma 300/4 with an AF x1.4 teleconverter, and if yes, then > which one and how well does the AF work ? > > Doug's comments agree with the information that I've found, but it's > always best to get the opinion of somebody who has actually used all > of the lenses being compared. The off-warranty repair work is a > good recommendation for Sigma. ------- End of Original Message -------
