>The modern AF Nikon cameras use electrical as well as mechanical >interfaces to the lenses, and can drive in-lens motors for faster >focusing with the big lenses that need the help. > > >No, but you'll see quite a few using them. Not the top news pros >you'll see gathered at major events, but lots and lots of the rest. >Sigma has made quite a few interesting lenses lately, including the >12-24mm full-frame zoom and the 10-20mm crop-factor zoom. Very interesting focal lengths indeed, And if the quality and dependability was better I would consider them too.> >> > >Sure; partly because they sell so many more lenses than Canon or >Nikon. More lenses, same problem rate, more problems. Also they sell >more low-end lenses, and no doubt have a higher problem rate on those. I am not so sure about the sales numers though, Canon just surpassed its 30 millionth EOS lens not to long ago. >I don't think we have enough information to actually compare the problem rates. Sure we do a quick way is to take a local poll about returns on factory vs non factory lenses. I will bet the PMA has the numbers locked away somewhere in a vault. >Also Sigma has a lot more problems with Canon than with Nikon, from >what I've read. Agreed and again this is due to poor design, compatibility issues and the EOS lens communication algorithms, Canon won't share its info with anyone. > >> >> This list is for educators, I've given my experience to those that listen, if you have somthing to refute the thousands of Sigma users who have had very bad issues with the lenses than speak up, if not learn from what I've had to say and the same with countless others who have gotten hosed buying cheaply built gear from Sigma. Like I have said before the before newbies should be encourged to buy the best possible tools. Even if it means buying used stuff to start Also I would like to apologize for the terseness of my post it was unintended it;s just that I see pots of folks waste cash getting something that is obviously not even close to the top of the line and with a little research and time they can get better gear. > >And lots of other people have benefitted greatly from being able to >get cheaper, high-quality lenses from Sigma. I've even got one Sigma >lens myself (the 105mm macro), and might well have gotten the 10-20mm >if it had been out a bit longer at the time I bought in that range (I >ended up with the Tokina 12-24mm f/4). I have always heard good things about their macro, but again that is one lens. Cheers Les
