How zoom stereo microscope works The visual mechanism of an up to date zoom stereo microscope is very complex and for a microscope to work well, the whole optical path has to be very precisely set up and controlled. Regardless of this, the basic optical main beliefs of a microscope are fairly simple. The objective lens is, at its simplest, a very high powered magnifying glass, a lens with a very short central length. This is brought very close to the specimen being examined so that the light from the sample comes to a focus about 160 mm inside the microscope tube. This creates an enlarged image of the subject. This image is inverted and can be seen by removing the eyepiece and insertion a piece of tracing paper over the end of the tube. By careful focusing a rather not bright image of the specimen, much enlarged can be seen. It is this real image that is viewed by the eyepiece lens that provides additional magnification. In a large number of zoom stereo microscopes, the eyepiece is a compound lens, which is made of two lenses one close to the front and one near the back of the eyepiece tube forming an air divided couplet. In many designs, the near image comes to a focus between the two lenses of the eyepiece, the first lens bringing the real image to a focus and the second lens enabling the eye to focus on the now virtual image. In all microscopes the image is viewed with the eyes focused at infinity. Headaches and tired eyes after using a microscope are by and large signs that the eye is being forced to focus at a close distance to a certain extent than at infinity.

The zoom stereo microscope is designed differently from the other microscope, and serves a dissimilar purpose. It uses two separate optical paths with two objectives and two eyepieces to provide slightly different viewing angles to the left and right eyes. In this way it produces a three-dimensional (3-D) visualization of the sample being examined The zoom stereo microscope is time and again used to study the surfaces of solid specimens or to carry out close work such as sorting, dissection, microsurgery, watch-making, small circuit board manufacture or inspection, and the like. Enormous working distance and depth of field here are important qualities for this type of microscope. Together any individual are inversely correlated with declaration: the higher the resolution (the shorter the distance at which two adjacent points can be distinguished as separate), the less important the distance downward of field and working distance. A zoom stereo microscope has a useful magnification up to 100×. The resolution is maximally in the order of an average 10× objective in a compound microscope, and often much lower. The zoom stereo microscope should not be puzzled with a compound microscope equipped with binocular eyepieces. In such a microscope both eyes see the same image, but the binocular eyepieces provide greater viewing comfort. On the other hand, the image in such a microscope is no different from that obtained with a single monocular eyepiece.

Digital presentation with zoom stereo microscopes Lately various video dual CCD camera pickups have been fitted to zoom stereo microscopes, allowing the images to be displayed on a high resolution LCD monitor. Software converts the two images to an integrated into 3D image, for viewing with plastic red/cyan glasses, or to the cross converged process for clear glasses and somewhat better color correctness. The outcome is viewable by a group wearing the glasses. These files should be recorded as well.