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Photonics Dictionary

pentamirror

A pentamirror is an optical component found in SLR cameras, composed of multiple flat mirrors arranged in a pentagonal configuration. Its primary function is to redirect light from the camera lens to the viewfinder, allowing the photographer to see through the lens and compose the shot accurately.

Configuration: The pentamirror typically consists of three or more mirrors positioned to create a light path that reflects the incoming image from the camera's lens to the viewfinder. The arrangement maintains the correct orientation of the image so that it appears upright and correctly oriented to the photographer.

Light weight and cost: Compared to a pentaprism, which is a solid piece of glass, a pentamirror is made of individual mirrors, making it lighter and less expensive to produce. This is why pentamirrors are commonly used in entry-level and mid-range SLR cameras.

Image quality: While pentamirrors are effective, they may introduce slightly more light loss and potential distortions compared to pentaprisms, which can affect the brightness and clarity of the viewfinder image.

Applications: The primary application of a pentamirror is in SLR cameras, where it allows photographers to see exactly what the lens sees, aiding in accurate framing and focusing of the image.

In summary, a pentamirror is an arrangement of mirrors in a pentagonal shape used in SLR cameras to direct light from the lens to the viewfinder, offering a cost-effective and lightweight alternative to pentaprisms.

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