Rechip Old Sigma Lens So That It Plays Nicely with Your New Canon DSLR
Older Sigma lenses that were designed for Canon EOS film cameras often don't work correctly when mounted onto a new EOS digital SLR, even though the newer bodies still use Canon's EF mount. If you're an owner of such a lens, you might have heard that you can send it in to Sigma's service center for them to rechip it in order to make it compatible again.
Did you know that those of you who are handy with electronics can actually do the rechipping yourself at home? Photographer Martin Melchior recently did this with his Sigma 70-210 f/2.8 APO lens, and says that anyone with basic soldering skills can do the same.