在光无源器件的准直和耦合中，使用的准直器主要有 G-Lens 准直器， C-Lens 准直器和 D-Lens 准直器。 G-Lens本质上为一个折射率渐变形自聚焦透镜 ： C-Lens本质上是一个平凸透镜 ：

2013年12月11日 · The D lenses are older lenses. These lenses would include an aperture ring and would be compatible with older Film cameras. Few D lenses are AF lenses which do not include an auto-focus motor inside the lens.

C-Lens & D-Lens Build low insertion loss fiberoptic components – including switches, isolators, circulators, DWDMs, fiber amplifiers, and more – with these miniaturized optics. These are miniature optics for collimating and coupling fiberoptics, or in-coupling light from laser or …

2019年12月18日 · All lenses introduced since 1992 have been "D." This can help the camera set flash exposure more accurately if the subject occupies only a small part of the frame, or if you're shooting into mirrors or very light or dark subjects. With non-D lenses the camera is more likely to get tricked into the wrong exposure in these odd cases.

2021年5月3日 · You use “AF-D” or “D lenses” repeatedly, but the centerpiece of your picture of a camera and assortment of lenses is a 20mm f/2.8 AF, with no D. People keep forgetting that about 1/3 of Nikon’s “screwdriver” AF lens production did not have the “distance” function, an actually quite trivial feature that only make a slight aid ...

Coherent 高意推出了其首款 HyperRapid NXT 266 工业级深紫外皮秒激光器，可提供小至 5 µm 的非凡精密制造技术。 激光器光学元件是什么？ 什么是透镜？ 了解 Coherent高意的材料生长、制造、涂层和组装垂直整合能力以及严格的质量保证。 了解这些能力如何确保我们光学器件的性能和可靠性，并最大限度降低供应链风险和不确定性。 使用 Coherent 的小型化光学元件构建低插入损耗光纤组件，包括开关、隔离器、循环器、DWDM、光纤放大器等。

2024年8月5日 · Nikon AF-D lenses are a series of autofocus lenses designed for Nikon cameras. The “D” indicates that these lenses include a distance encoder, enhancing autofocus accuracy and exposure metering. They are known for their versatility, exceptional image quality, and compatibility with Nikon’s F-mount cameras.

2017年8月31日 · With some of the nicest bokeh rendering to boot! The 50mm f1.4 AF-D is sharp well into the corners at f2.8 and just pure magic when shooting portraits at f2.2. As you go to the wide angles,...

2022年6月28日 · d lens最大的問題點應該是因為寬度較一般透鏡小，導致兩側的利用率不佳，應該適當地在兩側加上設計參數改善利用率，如下圖，在側壁做一哥有焦點的曲面，將led光源打在側壁後不可控的光線變為可控，再經由光跡分析下適當的參數應該就可以得到較好的設計

Shop the latest mirrorless & DSLR cameras and NIKKOR lenses from the official Nikon eCommerce site. Explore our innovations and photo equipment!