National Optical Model 420-420AHF-10,  Stereo (10x through 40x Magnification)

National Optical Model 420-420AHF-10, Stereo (10x through 40x Magnification)

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National Optical Model 420-420AHF-10,  Stereo (10x through 40x Magnification)
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Model 420-420AHF-10, Stereo (10x through 40x Magnification)
The convenience and versatility of viewing a large picture at 10x magnification, then zooming continuously all the way to close-up detail at 40x magnification. Upright, unreversed 3-dimensional image remains in focus throughout zoom range. Optional eyepieces and auxiliary objectives expand magnification range and working distances.
Features top light with directional beam, bottom light with cool, long-life fluorescent illumination.
OPTICAL SYSTEM
Paired widefield 10x eyepieces are 45 inclined, with dual diopter adjustments, interpupillary adjustment from 55mm to 75mm. Accepts 23mm eyepiece reticle.
Viewing head rotates 360.
Achromatic, color corrected lenses.
Continuous magnification from 10x thru 40x. See specification chart for full magnification range available with use of optional auxiliary lenses
FOCUSING
Rack and pinion focusing with large dual focusing knobs with slip clutch to prevents damage to mechanism. Tension adjustment eliminates focus 'drift'.
ILLUMINATION
Top light is 12v 15 watt halogen, bi-pin with directional beam and rheostat control.
Bottom light is 110v 5 watt fluorescent for cool operation, greater light efficiency.
Base mounted light controls permit choice of top only, bottom only, or dual illumination.

Heavy-duty 3-wire grounded cord and plug.
Available with 110v or 220v (220v is CE approved and supplied with European plug). To order 220v, add -220V to end of model number.
STAGE
Two 80mm stage plates (frosted glass and reversible black/white plastic contrast plates).
Blue filter for transmitted light.
Locked-on stage clips
FRAME
Professional, all-metal frame, gray enamel finish.
Heavy-duty fixed arm stand. Note: #705-420 0.5x auxiliary objective is not operational on this particular frame.
Height: 340mm (13-3/8 in.).
Base width: 171mm (6-3/4 in.), Base depth: 242mm (9-1/2 in.)
Net wt. 28 lbs)
PACKING
Molded styrofoam container with rubber eyeshields, vinyl dustcover and instruction manual.
Individual: Ship wt.  (33 lbs), Dimensions 550x375x375mm (22x15x15 in.)
WARRANTY
Lifetime limited warranty excluding bulb, cord, and fuse.

Features Benefits
10x through 40x zoom magnification Compact unit with top and bottom illumination

Copyright © Edward Nightingale, Fort Myers, Florida
Enight@earthlink.net