Sigma 18-50mm F2.8 DC DN | Contemporary: B&H Photo / Amazon / Adorama Sigma 10-18mm F2.8 DC DN | Contemporary: B&H Photo / Amazon / Adorama Firmware update for Canon RF Mount lenses Thank you for using SIGMA products. We are pleased to announce that the download of firmware for SIGMA’s RF Mount is now available. The changes in this firmware are as … Continue reading Sigma 10-18mm F2.8 DC DN and Sigma 18-50mm F2.8 DC DN Firmware Updates