The rectangular, large field lens of the 2636's is ideal for reading and writing. Special Features: -Aspheric PXM lightweight lens with cera-tec coating -Open base for handwriting -Transparent plastic base for clear, bright viewing Note: 2636-11 features 7D aspheric lens with "snap-on" 4D lens attached underneath, 4D "snap-on" lens can be easily removed for greater working space for tasks such as handwriting. Magnification: 3.8x Diopter: 11D Illumination: no Lens Size: 100 mm x 75 mm Lens Type: Aspheric Case: no Case Material: no Bulb: no Power Source: no Mount: no Lens Material: PXM Plastic with Cera-tec Coating Miscellaneous: Open Base for Writing Instrument, Tiltable Lens, 4D Snap-On Lens is Detachable Lens-to-Image Distance: 215 mm Enlargement Ratio/Transverse Magnification: 3x Maximum Allowable Add: 4.9D Arm/Neck: no Display: no

• Date First Available ‏ : ‎ October 27, 2008
• Manufacturer ‏ : ‎ Eschenbach