The Schneider Optics 6 inch Diopter Full +3 Filter is made from the finest optical glass. It feature Schneider Optics's hard, anti-reflective coating on both front and rear surfaces. This measurably reduces light loss and flare while helping to ensure proper color, contrast and overall image quality. Screw-on Schneider Optics Diopter is supplied with brass mounting rings, while drop-in models feature rugged black anodized aluminum rings.
The Diopter is protected by a unique mounting technique which ensures superb structural integrity and consistent long-term performance, even in the harshest production environments. Diopter can increase the minimum working distance enabling closer focus from a greater working distance. Calculation of strength depends on focal length, focus setting, object distance and size.