Interview With Optical Engineer That Made the Sigma 35mm f/1.4 and 18-35mm f/1.8 Lenses
Sigma 35mm f1.4 DG Thanks Mark. lenstip published a long interview with the optical engineer that designed the outstanding Sigma 35mm f/1.4 DG HSM and Sigma 18-35mm f/1.8 DC HSM lenses.…