Ronkonkoma, NY – November 26, 2019 – Sigma Corporation of America, a leading still photo and cinema lens, camera, flash and accessory manufacturer, today announced its Dealer Workshop lineup for the month of December. Celebrate the holidays by sharpening photography skills across disciplines such as bird photography, night sky photography and more. Attendees to Sigma workshops will also Ronkonkoma, NY – November 26, 2019 – Sigma Corporation of America, a leading still photo and cinema lens, camera, flash and accessory manufacturer, today announced its Dealer Workshop lineup for the month of December. Celebrate the holidays by sharpening photography skills across disciplines such as bird photography, night sky photography and more. Attendees to Sigma workshops will also