National 205-RLED Cordless Three Objective Single Viewing Microscope

National 205-RLED Cordless Three Objective Single Viewing Microscope

National 205-RLED Cordless Three Objective Single Viewing Microscope

B&H # NA205RLED MFR # 205-RLED

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Product Highlights

  • 4x / 10x / 40xR Color Coded Objectives
  • Achromatic / Parfocalled / Parcentered
  • 10x /18mm WF Eyepiece with a Pointer
  • Rotating Head & 45° Inclined Ocular
  • Separate Fine / Coarse Focusing Controls
  • LED Illumination Equivalent to 20W Bulb
  • 0.65 NA Abbe Condenser & Disc Diaphragm
  • Platform Stage with Coupled Slide Clips
  • Cast Aluminum Frame with Handles
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National 205-RLED overview

  • 1Description

The 205-RLED Cordless Microscope from National Optical is a three-objective cordless microscope with a 45° inclined monocular, and a 10x eyepiece with an 18 mm wide field of view. The three objectives are 4x, 10x, and 40xR, and feature achromatic lenses which reduce color distortions introduced by imperfections of optical elements. Reducing these color distortions allows you to see sharper images with better color fidelity. The retractable 40xR objective has a spring-loaded lens which will retract when it touches the slide thereby protecting the lens and the slide. The parfocalled and parcentered design allows for switching objectives without having to realign your sample and without losing focus. The microscope also features a fine and coarse focusing and a platform stage with two spring-loaded coupled slide clips.

To see details of your specimens more easily, the microscope has an LED illumination system with adjustable brightness. The light intensity it delivers is equivalent to that of a 20W incandescent bulb. The white light from the bottom LED emitter is collimated by a 0.65 NA Abbe condenser. Located underneath the stage is a disc diaphragm with apertures of different sizes. It allows you to change the width of the illumination beam which helps you tune the image contrast when using different magnifying powers.

Included with the microscope are three rechargeable AA NiMH batteries, a wall power adapter, a dustcover, and two Allen wrenches for rack stop and eyepiece socket tension adjustment. To recharge your microscope's batteries, just connect the microscope to the wall power adapter.

Optical System

  • Achromatic 4x, 10x, 40xR
  • Objective 40xR is retractable
  • Total magnification: 40x, 100x, 400x
  • 10x/18mm wide field eyepiece has a pointer
  • Parfocalled and parcentered
  • Monocular is 45° inclined
  • Head rotates 360°


  • Separate fine and coarse focusing knobs
  • Slip clutch prevents damage to focusing system
  • Tension adjustment eliminates stage drift
  • Safety rack stop prevents damage to slides and objective lenses

Illumination and Power

  • LED illumination equivalent to a 20W tungsten bulb
  • 0.65 NA Abbe condenser lens with spiral focusing mount
  • Cordless operation using included rechargeable batteries
  • Rheostat intensity control


  • Platform stage
  • Disc diaphragm with apertures
  • Coupled slide clips

Construction Details

  • Objective turret in reverse position
  • Cast aluminum frame with handles
  • Gray enamel finish
In the Box
National 205-RLED Cordless Three Objective Single Viewing Microscope
  • 3 x AA NiMH, Rechargeable Batteries
  • Wall Power Adapter
  • Dustcover
  • 2 x Allen Wrenches
  • Limited 5-Year Warranty on Microscope
  • Table of Contents
    • 1Description

    National 205-RLED specs

    Microscope Type Compound
    Eyepiece 10x / 18 mm, wide field
    Nosepiece Reverse
    Objective(s) 4x, 10x, 40xR
    Head Rotating 360°
    Focuser Fine / Coarse
    Light Source LED
    Light Control Rheostat
    Specimen Stage Platform
    Battery / Runtime 3 x AA NiMH, rechargeable / 50 hr max
    Charging Time 8 hr minimum
    Overall Dimensions 18 x 12 x 11" (45.7 x 30.5 x 28 cm)
    Weight 8 lb (3.6 kg)

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