National Optical 420AH Stereo Zoom Microscope

National Optical stereo zoom microscope on a fixed-arm stand offers upright, unreversed 3-dimensional images that remain in focus throughout the zoom range. Optional auxiliary objectives expand magnification range and working distances.

• Objective Lenses: 1x - 4x objective - provides continuous zoom magnification. Viewing head rotates 360°.
• Eyepieces: Choose from paired widefield 10x or 15x eyepieces. 5x or 20x eyepieces can be ordered below. Eyetubes are 45° inclined, with dual diopter adjustments, interpupillary adjustment from 55mm to 75mm. Accepts 23mm eyepiece reticle (#965-400-05 or #965-400-10). Trinocular version has a beam splitter which allows the light from the left eyetube to travel to the trinocular port for better camera light. Trinocular version includes a C-Mount Adapter as well as an SLR adapter.
• Total Magnification: Zoom range of the following: Please view the Magnification Chart for complete details on working distance and field size at different magnifications.
  • 5x eyepieces - 5x - 20x
  • 10x eyepieces - 10x - 40x
  • 15x eyepieces - 15x - 60x
  • 20x eyepieces - 20x - 80x
• Specimen Stage: Two 80mm stage plates (frosted glass and reversible black/white plastic contrast plates). Includes blue filter for transmitted light and locked on stage clips.
• Stand: Professional all-metal frame - heavy-duty fixed arm stand. Note: #705-420 0.5x auxiliary objective is not operational on this particular frame.
• 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. Lights can be operated independently of each other.
• Size & Weight: 13 3/8 " high, extends to 17" for larger objects, 11.7 lbs.
• Warranty: Lifetime limited warranty, excluding bulb, cord and fuse.