On 7/16/06, fotofx@xxxxxxxxxxxxx <fotofx@xxxxxxxxxxxxx> wrote:
Good for you Howard, You will please notice a few points re: my post. First it was in referance to CANON cameras. Not Nikons. Nikon still uses a mechanical system with it lenses. Canons is electro optical. Also you are a user of the lenses. a singularity.
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.
Sigma sells lenses becuase stores sell them in volume (usually to rookies who just dropped a large pot of cash on a body) and they are cheaper than factory glass. You won't see lines of pros at the counter clamoring for Sigma glass.
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.
Do a quick google search on problems with Sigma and see what pops up. Various focal lengths, camera bodies and issues.
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 don't think we have enough information to actually compare the problem rates. Also Sigma has a lot more problems with Canon than with Nikon, from what I've read.
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.
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). -- David Dyer-Bennet, <mailto:dd-b@xxxxxxxx>, <http://www.dd-b.net/dd-b/> RKBA: <http://www.dd-b.net/carry/> Pics: <http://dd-b.lighthunters.net/> <http://www.dd-b.net/dd-b/SnapshotAlbum/> Dragaera/Steven Brust: <http://dragaera.info/>
