47mm

47mm is a unit of measurement commonly used in photography and geology. It is a caliber measurement, used to denote the diameter of a lens or bore in millimeters. In photography, a 47mm lens is typically used for wide-angle shots, offering a broader field of view and reduced distortion at the edges of the frame. These lenses are often used in landscape, architecture, and interior photography to capture expansive scenes and emphasize spatial relationships.

In geology, 47mm is a gauge for exploring the size of small insects and ores. Geological and entomological sampling often employs precise measurements to categorize and classify species. When it comes to these kinds of sampling techniques, using the precise metric scale like 47mm gauge is the standard due to its utility in quantifying tiny sizes and data collection.

Examples of 47mm lenses can be found in various camera models, each having unique characteristics and specifications. Most 47mm lenses used in photography are standard polycarbonate plano-convex lenses, though they can vary in design depending on specific requirements, like aperture, focal length, and intended applications. Being a subset of 50mm variant, 47mm shares similar features, albeit with some adjustments to focal length and optical configuration to better suit its function.

When installing a new lens with a 47mm thread size, it's crucial to pair it with an appropriate lens filter that matches this diameter. Many types of filters, such as polarizing filters, UV filters, and neutral density filters, come in various diameters to accommodate different lens threads. Misaligning the diameter can lead to issues like improper fitting, uneven light dispersion, and an increase in camera size.