Kính hiển vi công cụ M-Service Raster zoom system
If the magnification has to be changed during a test or measurement procedure, use of a raster zoom is a considerably more user-friendly system compared with the CV system. The systems provide a very wide zoom range or field of view and an impressive working distance which does not be have to be changed within the zoom range. Also the depth of focus is greater than that of the CV system.
A raster zoom system consists of the actual zoom optics (0.12x or 5x), an adapter with an intermediate optic of 3.5x to 3.5x, the C-Mount adapter and the camera. It is assembled based on your requirements or based on a joint test carried out at your workshops. The zoom range (magnification and field of view) can be changed by supplementary lenses. The supplementary lenses decide the working distance, magnification, and field of view, whereas the adapter at the top only changes the magnification and field of view.
The supplementary lenses are available with magnifications of 0.25x, 0.5x, 0.75x, 1.5x and 2x. The zoom lens without a supplementary lens is calculated as 1x. The working distances which this gives range between 356 mm and 36 mm. The individual click stops are calibrated and stored in the Metric. On the 12000 series zoom lenses, there are a total of fourteen ratchet steps. This number is multiplied by each supplementary lens used.
Besides this the magnification and field of vision can be affected by selecting different chip sizes of the USB cameras. When assembling the system the first thing to determined is which fields of vision or magnifications are required. Then the components can be assembled based on the matrix.