The SIGETA Elementary is a simple operating device, but not a simplified student microscope. The basic configuration has 3 modes of magnification - 40, 100 and 400 times. The model is equipped with achromatic objectives and an eyepiece Ramsden: its optical scheme is specifically adapted to the vision system for children 8-14 years old and allows a residual transverse chromatic aberration.
The microscope tripod and stand (base) are integral metal parts assembled together to allow adjustment of the microscope frame tilt. If required, the frame and the eyepiece tube and objective revolving nose piece can be angled vertically up to 60°. Under any position the horseshoe-shaped base of the body will stay firmly on a flat surface. The SIGETA Elementary microscope is the perfect solution for school biology classrooms: the instrument can be easily configured for the student's height and experimental conditions (sitting/standing, with or without replacement of specimens).
When focusing, the microscope optical unit is moved along the frame by means of the rail transmission mechanism. Its range of movement is approximately 2 cm, and there is a protective locking screw. For the preliminary sharpness setting and the subsequent fine focusing there are separate handwheels on both sides of the body. As for student microscopes, it is worth noting that the possibility of fine focusing is quite rare.
The SIGETA Elementary Student Microscope objective table is equipped with two metal slide clamps and a disk diaphragm with holes is fitted directly under the table top. By setting the aperture on the optical axis of the corresponding diameter (from 5 to 12 mm), it is possible to change the contrast of the image and the shape of the illuminated area.
Illumination under the examined material is accomplished by means of a two-sided mirror attached under the objective table. One of its sides is flat, the other is concave for more effective light focusing. The frame, including both mirror plates, has absolute freedom of rotation around the rod: in almost every situation it helps to use external light for illumination. If there is an insufficient lighting, the mirror should be substituted with an electric illumination module.
There is nothing redundant in the Elementary microscope kit, with no glossy packaging: it is a substantial, maximum cheapened instrument, struggling for consumer sympathy not by its color polygraphy, but by the high-quality of the optics.