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The 431-430PHF-20 2x/4x Stereo Microscope from National Optical is a dual magnification stereoscopic microscope designed for laboratories and university students. The stereo (two) eyepiece configuration is preferred by most researchers and students because of the superior depth of field and comfort compared to monocular microscopes. This model of the 430PHF stereo microscope has a paired 20x eyepiece delivering 40x and 80x magnification. Two achromatic paired objectives are parcentered and parfocalled to keep the specimen centered and focused when switching between the two magnification settings.
The 430PHF can illuminate the specimen from above using a 15W halogen light and/or from below the stage using a 5W fluorescent light; each light source is activated separately by base-mounted On/Off switches. To help optimize the brightness and contrast of the specimen, the top (incidental) light beam is intensity and direction adjustable.
A user-friendly design complements the range of features that make the 430PHF stereo zoom microscope a welcome addition to labs and classrooms. This configuration of the 430 series microscope includes a post-mounted viewing head that is height-adjustable to accommodate specimen heights up to 72mm / 2.8". The viewing head is also capable of 360° rotation to help share the stereo eyepiece among colleagues and students without moving the microscope. An adjustable interpupillary distance, adjustable diopter correction, and reticle holder/retainer provide this 430 series microscope with the flexibility needed to create a customized viewing experience.
Paired 20x inclined eyepiece
2x and 4x achromatic objectives
40x and 80x magnification
Parfocalled, parcentered, paired objectives
94mm / 3.7" working distance, 72mm / 2.8" maximum specimen height
Eyepiece with diopter adjustment and reticle holder/retainer
55-75mm / 2.2-3"interpupillary distance
Rack and pinion focus system
Slip clutch prevents over-turning
Tension adjustment prevents focus drift
Incidental (top) 15 watt halogen illumination with beam intensity/direction controls
Transmitted (bottom) 5 watt fluorescent illumination with blue filter
Dual base-mounted On/Off switches
360° rotating viewing head
Post-mounted viewing head with locking support collar