Ronkonkoma, NY – March 5, 2020 – 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 March, featuring ten specialty workshops for photographers of all skill levels. Photographers can refine their skills through these Sigma expert-led workshops with unique hands-on experiences. Ronkonkoma, NY – March 5, 2020 – 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 March, featuring ten specialty workshops for photographers of all skill levels. Photographers can refine their skills through these Sigma expert-led workshops with unique hands-on experiences.