It is also notable that Sigma has introduced a lens in the Four-Thirds mount, if memory serves me correct that would be the first non-Olympus Four-Thirds lens to be put out, and I would think it is probably a lot cheaper than the Olympus Zuiko glass.
Oh my I missed out that one. That looks like a lens I will get. I wish they has put in HSM into lenses like the 18-50 though. Quite difficult to make up put money into a main lense without the HSM, AF-S, USM.
There's no problem using them with film cameras as long as they are not 'DC'. DG lenses are suppose to have an extra coating at the rear element to reduce reflection from the CCD. Haven't seen any benefits of this though as I've not been able to detect any differences in image quality from the 105mm f/2.8 Macro EX DG and non-DG versions, even under very bright situations.