40×Objektiv

40xObjektiv refers to a lens with a magnification factor of 40 times. In photography and microscopy, the "x" denotes the magnification power, indicating how much larger an object will appear compared to viewing it with the naked eye. A 40x objective lens is a common feature in many biological and laboratory microscopes, allowing for detailed observation of small specimens such as cells, bacteria, and cellular structures.

These lenses are typically used in conjunction with a lower power objective, such as a 4x or 10x, and require immersion oil for optimal performance at high magnifications to reduce light scattering and increase numerical aperture. The numerical aperture (NA) of a lens determines its resolution, which is its ability to distinguish between two closely spaced points. A higher NA, often achieved with oil immersion and high magnification, leads to better resolution.

The working distance of a 40x objective lens is generally short, meaning the lens must be brought very close to the specimen. This necessitates careful handling and the use of a precise focusing mechanism. In scientific research and educational settings, 40x objectives are crucial for tasks ranging from identifying microorganisms to examining tissue samples. The clarity and detail provided by such a lens are essential for accurate analysis and discovery in various scientific disciplines.