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A manual zoom lens, such as those produced by Fujinon, refers to a type of camera lens that allows the photographer to manually adjust the focal length to achieve different levels of magnification. Unlike automatic or power zoom lenses, which can be adjusted electronically, manual zoom lenses require the photographer to physically turn a zoom ring on the lens to change the focal length.

Here's a general use of a manual zoom lens, particularly one from the Fujinon brand: Zoom Ring: The lens features a prominent zoom ring, usually located near the front end of the lens barrel. This ring is rotated by the photographer to adjust the focal length manually. The focal length range is typically marked on the lens, allowing users to see the level of zoom. Focal Length Scale: There is a scale on the lens barrel indicating the current focal length setting. This helps the photographer to easily identify the level of magnification and framing. Manual Focus Ring: In addition to the zoom ring, a manual zoom lens often includes a separate manual focus ring. This ring allows the photographer to manually adjust the focus distance for precise control over the sharpness of the image. Aperture Ring: Some manual zoom lenses, including those from Fujinon, may also have an aperture ring. This ring allows the user to manually set the aperture size, controlling the amount of light that enters the lens. Solid Build Quality: Fujinon lenses are known for their sturdy and durable construction. The materials used in the lens contribute to its overall build quality, providing a reliable and long-lasting piece of photographic equipment. Smooth Zoom and Focus Action: A well-designed manual zoom lens, especially from reputable brands like Fujinon, offers a smooth and precise zooming and focusing action. This allows photographers to make subtle adjustments easily. Compatibility: Fujinon lenses are often designed to be compatible with specific camera systems, such as Fujifilm X-series cameras. This ensures optimal performance and integration with the camera's features. Optical Quality: Fujinon lenses are known for their high optical quality, providing sharp and clear images. The lens elements and coatings contribute to minimizing aberrations and enhancing overall image quality.