Sigma technologies are based on reverse-engineering which means what work on
the current cameras might not work on upcoming models. There have been many
complaints on this matter and in some cases, the regional distributors will
offer one free chip upgrade, and other time they will charge you for that.
In the worst case, chip upgrade is not possible because Sigma decided not
to. So, while the initial investment might sound tempting, might prove to be
a rip-off eventually. Also ED was employed to correct aberration, not flare.
But the degree of correction is unknown. I used to be a Sigma user, but not
anymore. And I have been reading complaints on their coating deterioration,
glasses deterioration (due to humid atmosphere perhaps), flare problem,
mechanical failure & electronic capability problems. Just too many to
recommend really.
Yours regards,
Alan Chan
http://www.pbase.com/wlachan
Capability problems? Could you elaborate a bit, thanks. I've heard the new
one's got an ED element or something. Supposedly controls flare well, but
need to get some real reviews first.. And when you say avoid Sigma, do you
mean ALL Sigmas??
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