On Jul 10, 2005, at 11:44 AM, Christian wrote:
From: "Thibouille" <[EMAIL PROTECTED]>
Sigma optics are usually compatible with bodies available at the time
the lens is out.
But older or newer bodies often have problems.
I think this is more of a problem with Canon.
I find it very hard to direct the blame for Sigma malfunctions to Canon.
- All Canon brand EOS lenses work flawlessly on all EOS bodies,
regardless of their age.
- Sigma does not license the EOS mount specification and reverse
engineers it instead, ostensibly to save money.
- Sigma's quality control is extremely variable, evidenced by my own
personal experience and by the experience of a major and well
respected dealer in my neighborhood. The fact that Canon's lenses
work on all Canon bodies, regardless of age, generally indicates a
high quality acceptance testing program, which is exactly what Sigma
cuts corners on to offer low prices.
- Problems have been experienced by more than just Canon users with
Sigma lenses. I had problems with them on Minolta and Nikon bodies. I
was already disgusted with them before I owned Canon EOS gear.
My experience with Sigma lenses has been such that I will never even
try one again, regardless of how many people tell me what a great
Sigma lens they have.
Godfrey
