Ronkonkoma, NY – December 17, 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 January. Photographers looking to kick off the new year with fresh tips and tricks can refine their skills through these hands-on Sigma expert-led workshops. In Ronkonkoma, NY – December 17, 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 January. Photographers looking to kick off the new year with fresh tips and tricks can refine their skills through these hands-on Sigma expert-led workshops. In