DA7 has a focal length of 6 with a 2.75X magnification.
Optivisor Replacement Lens, 5, 2-1/2x, 8 Inch Range
Optivisor Headband Magnifier choose Your Magnification 29.47X - Hong Kong
The OptiVisor is perfect for anyone whose profession or craft requires close accurate work with both hands free! Works well over prescription glasses.
OptiVisor Professional Magnifier Hands Free Headband for Jewelers and Watchmakers by Donegan - Select Magnification
Magnifying Visors for Painting Miniatures (Tips and Recommendation) - Tangible Day
Donegan DA-10 OptiVisor Headband Magnifier, 3.5x Magnification, 4 Focal Length : : Health, Household and Personal Care
Donegan Optical - Optivisor Binocular Magnifier
Donegan OptiVisor Headband Magnifier with Optional Light
Donegan OptiVisor Headband Magnifier with Optional Light
Magnifier Headband Lens 1.5x Magnification DA2 Donegan Optivisor - HH505
Donegan Optical-OptiSIGHT Magnifying Visor: Black. This visor provides hands-free magnification for more accurate and efficient viewing. The visor tilts up for normal viewing or down for magnification. OptiSIGHT brings work closer into focus, reducing eyestrain and fatigue. This 12x7-3/4x2 inch package contains one magnifying visor with three interchangeable lens plates (3x, 4x and 5x magnification). Made in USA.
Black - OptiSIGHT Magnifying Visor - Donegan Optical
Donegan CO-3 Clip-On Binocular Magnifier, 1.75X Magnification, 14 Focal Length : Electronics
Optivisor Optical Glass Binocular Magnifier - 7 Diopter 2.75X
Hands-free optical binocular magnifier with a precision ground and polished glass lens is for use on viewing items 6 inches away. Powerful 2-3/4 times
Optivisor Optical Glass Binocular Magnifier - 7 Diopter 2.75X
Donegan DA-2 OptiVISOR Headband Magnifier, 1.5X Magnification Glass Lens Plate, 20 Focal Length : Buy Online at Best Price in KSA - Souq is now : Arts & Crafts
OptiVISOR® Headband Magnifiers 1.5x -3.5x