Nikon Eclipse Si Trinocular Microscope

by Nikon

 Available in two configurations:

  • Option 1 - 4x, 10x, 40x Objectives 100x Objective NOT INCLUDED $3895
  • Option 2 - 4x, 10x, 40x & 100x INCLUDED $4395


  • Optical system: CFI60 Infinity optical system
  • Illumination: High luminescent white LED illuminator (Eco-illumination)
    • Built-in fly-eye lens
    • Up to two 45 mm diameter filters can be installed
    • Light Intensity Management (LIM) feature included
  • Focusing: Coaxial coarse/fine focusing (located on both sides), cross roller guide
  • Focusing stroke: Up 2 mm/Down 13 mm, coarse: 37.7 mm per rotation, fine: 0.2 mm per rotation, minimum reading: 2 μm With coarse focus knob torque adjustment ring and stage vertical movement stopper
  • Optical Head: Siedentopf Trinocular Head
  • Eyepieces: With diopter adjustment E2-CFI 10X (20)
  • Tubes: Inclination angle 45°, pupillary distance: 50-75 mm
  • Eyepoint height: adjustable to 2 positions
  • Eyepiece: Port: 50:50, built-in 0.55X relay lens in camera port, with C-mount
  • Nosepiece: Reversed-type quintuple nosepiece (within main body)
  • Stage: Rectangular mechanical stage (within main body), with specimen holder 2L and vernier calibrations, cross travel: 76 (X) x 52 (Y) mm
  • Objectives (NA / W.D.)
    • CFI E Plan Achromat 4X (0.1/30mm)
    • CFI E Plan Achromat 10X (0.25/7mm)
    • CFI E Plan Achromat 40X (0.65/0.65mm)
    • CFI E Plan Achromat 100X Oil (1.25/0.23mm) Only supplied with Option 2 Purchase
  • Condenser: Abbe Condenser, NA 1.25, vertically movable and centreable
  • Fungus-proof treatment: Anti-fungal paint is applied around optical system
  • Power supply: Uses the included AC adapter (input: 100-240 VAC, 0.48A Max., 50-60 Hz, output: 5.0 VDC, 3.0A Max.)
  • Power consumption: 5W
  • Weight: Approx. 6.0kg (when equipped with binocular tube), approx. 6.4kg (when equipped with trinocular tube)

Focus in comfort. Comfort in focus.

Nikon has designed the ECLIPSE Si to meet the demands of professionals who spend extended periods of time using their microscope. The Si is ergonomically designed to enhance user efficiency. This powerful microscope helps you to stay focused for longer by reducing the strain on your body. The Nikon Si has been developed with the primary goal of reducing fatigue during microscope usage. Eliminating unnecessary adjustments and enables efficient, comfortable operation. The ergonomic design also enables natural posture, even when carrying out repetitive tasks.

Maintaining comfortable brightness whilst switching magnifications

Objectives with different magnifications transmit light to varying degrees. Therefore, light intensity must be adjusted every time the user changes the objective. In addition, when switching from high to low magnification objectives, the sudden increase in brightness often causes eye strain. The ECLIPSE Si features the intelligent Light Intensity Management (LIM) which automatically remembers and sets the light intensity level for each objective. The LIM feature reduces up to 40% of the time spent on adjusting light intensities*. With the ECLIPSE Si, users can increase comfort and save time even when the routine requires frequent magnification changes.

Push the brightness control knob briefly to activate the LIM feature

LIM feature OFF

Since brightness varies depending on the objective, switching magnifications can induce eye strain. LIM feature ON

LIM feature ON

The optimal light intensity level is automatically recalled and applied to each objective, therefore eliminating unexpected changes in light intensity when changing magnifications and streamlining workflow.

Low stage for effortless slide replacement

The height of ECLIPSE Si stage is 135 mm, which is about 50 mm lower than our conventional microscopes. The lower stage design reduces the range of motion required to exchange specimen slides, and in turn this can reduce arm and shoulder fatigue. Since the position of the stage movement knob is also lower, different areas on the specimen slide can be easily explored while resting your hands on the table. The lever for opening and closing the specimen holder has also been designed to be ergonomic with an easy-to-operate size and shape. Furthermore, the ECLIPSE Si features a 30% smaller stage compared to our conventional microscopes in order to optimise slide replacement.

Enables natural posture to be maintained throughout the entire microscope workflow

The inclination angle of the eyepiece tube is 45 degrees, which enables observation through the eyepieces while maintaining a natural posture. The low stage design also allows you to seamlessly switch from looking through the eyepieces to checking the slide placement on the stage without having to adjust your posture.

Worry free focusing thanks to vertical stop

The ECLIPSE Si is equipped with a stopper that can be used to set the upper limit of the stage height. The stage stops at the set height even when the focus knob is turned, thereby eliminating the risk of over-focusing and breaking the slides or damaging the objectives. Specimen exchange and focusing can be performed with confidence, without worrying about the stage height.

Easy operation just by turning the screw at the height you want to set

The stage does not rise above the set height

Pursuing stress-free ease of use

Nikon wanted to design a microscope that would eliminate fatigue incurred by frequent specimen exchanges and provide a more comfortable user experience. The ECLIPSE Si combines innovative features and intelligent design to minimize unnecessary body movements, saving time and reducing strain on the user even when examining a large number of slides.

Adjusting focus and moving the stage with one hand

The coarse and fine focus knobs are located on both sides of the microscope, making it possible to focus with either hand. In addition, the stage handle is positioned close to the focus knob, allowing users to easily adjust both the stage position and focus with the same hand. With the stage movement and focus controlled by the same hand, the other hand can be dedicated to rotating the nosepiece or replacing the slides. These features provide an efficient workflow even when examining a large number of specimen slides.

Status display

The illumination brightness is shown in a bar graph on the LCD. You can check the magnification at a glance while maintaining your observation posture.


  1. ECO Mode
  2. LIM Function
  3. Objective Name
  4.  Magnification
  5. Brightness

Changing magnifications comfortably

The reversed-type nosepiece provides easy access and visibility to the objective in use. The position of the nosepiece is low to reduce strain on the arm when frequent magnification changes are required. The nosepiece features an easy grip for smooth rotation, and accommodates up to five objectives to provide a wide range of magnifications.

Automatically turning off illumination after a certain period of time

The ECLIPSE Si is equipped with an ECO mode which automatically turns off the illumination after a certain period of inactivity. The length of the inactivity period is adjustable. With ECO mode, the ECLIPSE Si helps you save power without any effort.

Superior Optics for High Quality Images

Nikon’s advanced optical technologies, culminating from a long tradition as a microscope manufacturer, play a vital role in the ECLIPSE Si. The ability to fulfill the need for accurate observation of specimens is a source of pride for us. 

Excellent image flatness and chromatic aberration correction

The ECLIPSE Si employs CFI E Plan series objectives, which feature flat, sharp images up to the periphery of the field of view. These objectives are part of the CFI60 infinity-corrected optical system, which achieves both high resolution and long working distances. A wide variety of Nikon CFI60 objectives are available.

Observation with Eyepieces FOV of 22mm

The ECLIPSE Si can enhance the efficiency of clinical observations when equipped with FOV22 tubes* and lenses that enable a large 22mm field of view.

Long-life LED with constant color temperature

The high-intensity, white LED light source, features a long life of up to 60,000 hours. Since the color temperature remains constant even when the brightness is changed, the color of the image does not change when changing magnifications.

Blocking light from outside the field of view

The ECLIPSE Si is equipped with a field diaphragm that can be used to limit the illumination range for optimal observation and image acquisition. Adjusting the field diaphragm suppresses the occurrence of flare and ghosting, enabling high contrast image observation. During fluorescence observation, the range of photobleaching of specimens can also be limited.


Shipping and Handling:
All products purchased from will be despatched either same day or next day of your order being received. Delivery within Australia can be expected within 7 working days.