1. As expected, the Sigma 150-600mm f/5-6.3 Sports units are slowly starting to trickle in. The lens hit the US shelves in very limited quantity. Note that we can notify you when it gets in stock, for any of the shops listed here.
2. Sigma warns that the 150-600mm S cannot be used with most film cameras. A member of the DPReview forum, who owns the Nikon F100, asked Sigma for more details. Here is their reply:
It may very well work with the F100 but we cannot test it with all Discontinued cameras. The F100 may not drive the HSM motor correctly or may have different metering circuitry. As we have not tested it we cannot indorse it.
This pertains to all film SLR cameras with the exception of the Nikon F6 and Canon EOS-1V, which are compatible.