On Sun, Dec 28, 2008 at 10:30 PM, Godfrey DiGiorgi <[email protected]> wrote: > On Dec 28, 2008, at 6:59 PM, Adam Maas wrote: > >> The 10-20 had serious issues when originally released (As many Sigma's >> do). But they've got the issues under control and you can now reliably >> get a good copy (As happens to many Sigma designs once Sigma has >> ironed out their production bugs). It's heavy but not particularly >> large (Remember this is the equivalent of a 15-30mm lens, everything >> else of similar range is larger) > > I don't know what about it being an equivalent field of view on some other > camera would make any difference. > > The Sigma 10-20 is about three and a quarter by three and half inches in > size and weighs about a pound. The Pentax 12-24 is about the same. The > Pentax 14 I chose was a stop faster and a bit shorter, a little bit lighter > weight. Not a big difference between the three lenses. > > I don't trust Sigma quality control. At all. I've never seen them "iron out > their production bugs" ... people are still complaining about bad units on > the 30mm f/1.4 on new purchases three years after it was introduced. > > Godfrey
Early production Sigma designs's have failure rates often as high as 3 in 4 (look at the 50/1.4 HSM in Canon mount, the first 3 production runs wouldn't focus correctly past 10 feet). Late production Sigma's like the 10-20 is now fail at a rate marginally higher than everybody elses lenses. 1 in 10 or 1 in 20. Enough that people still complain, but low enough that its actually unusual to get a bad copy. -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- 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.
