The DA-3 is the most popular size for wood carvers. Magnifies 1-3/4 times. Focus is at 14 inches. Lenses are ground and polished to precision optical standards. Adjustable head-band conforms to all head sizes. Pivots allow the visor to be tilted out of the way when not in use, and at your fingertips when magnification is needed. Comfortable when worn for long periods of time. It also fits over glasses.