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Sigma releases firmware updates for its Canon EF and Nikon F lenses, MC-11 mount converter: Digital Photography Review
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Sigma MC-11 Firmware Update v1.21 - AlphaShooters.com
Firmware Update L-Mount Lenses - Sigma
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Product Software and Firmware Download | SIGMA Corporation of America
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How To Update the Firmware on Your Sigma Lens - YouTube
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Product Software and Firmware Download | SIGMA Corporation of America
