Won't need firmware updates for future lenses
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Won't need firmware updates for future lenses

The inside of the adapter features a black flocking fabric to prevent internal reflections occurring within the adapter tube. An LED on the side of the adapter shows whether the attached lens is compatible and whether it needs a firmware update. Sigma says the MC-21 comes pre-loaded with the data needed for the 29 listed lenses supported at launch but that future lenses will contain the necessary data, so the MC-21's firmware won't need updating to support future lenses.