L–21 advertising magnifier
Magnifying glasses are optical instruments used for observation of the object with a certain increase, and those equipped with measuring scale are used to measure length.
Technical data:
Magnification | 2.5 x |
Focal length (mm) | 89.17 |
Lens diameter (mm) | 30/40 |
Linear field of view (mm) | 22/32 |
Distance betwen the object and the surface of the lens – nominally (mm) | 85 |