Borescope

Borescopes can be connected to a camera in order to display the images on a monitor. Hence, understanding how the camera lens system works, will give you a better understanding of borescopes as a whole. This articles contains some technical information on this matter that might be useful to you.

The camera lenses are constructed from several lens elements, each of which aims to direct the path of light rays in a way that they recreate the image as accurately as possible on the digital sensor. The objective is to minimize aberrations, using the fewest and least expensive elements.

There are some important characteristics that one must know about cameral lenses. The first one is the focal length. Focal length is defined as the distance from the lens to the point of focus when the lens is focused on infinity. It determines the angle of view, which directly effects how much the subject will be magnified for a given photographic position. The focal length has direct impact on the sharpness of the image. The zoom camera lens work by varying the focal length within a pre-defined range, whereas this cannot be changed with a "prime" or fixed focal length lens. Researches have proven that as the focal length gets larger this opening also needs to get larger in order to let in enough light to expose our image.

The aperture range characteristic of a camera lens determines the size that the lens can open up or close down to let in more or less light, respectively. It effects the depth of focus on our subject. Apertures are listed in terms of f-numbers, which quantitatively describe relative light-gathering area. Or in other words, a smaller aperture means that objects can be in focus over a wider range of distance, a concept also termed the depth of field. Manufacturers usually specify the max and min available apertures. Lenses with a greater range of aperture settings provide greater artistic flexibility, in terms of both exposure options and depth of field.

Using an interchangeable camera lens allows you to exert more control and creativity over the image-taking process. Camera lenses for both digital and film cameras can be divided into three categories: standard camera lenses, wide-angle camera lenses, and telephoto camera lenses. Choosing the type camera lens depends images you want to make.

The standard /normal/ camera lenses are suitable for regular picture taking, like travel or individual photos. The wide-angle camera lenses give you a wide angle of view, hence a larger, sweeping perspective and better depth of field than a standard camera lens. This makes them suitable for covering large subject areas, like landscapes. The telephoto camera lenses are the opposite of wide-angle and are for narrow images. Macro camera lenses create extremely sharp images at short distances, while a fish-eye camera lens is an extremely wide-angle lens.

Upper Endoscopy | Borescope Lens | Camera Lens | Gradient Lens | Optical Lens | Rod Lens |