NOMENCLATURE

1Built-in telescopic lens hood

2Preset ring alignment index

3Preset ring locking screw

4Tripod collar locking screw

5Tripod collar alignment indexes

6Insertion-type filter holder

7Built-in rotatable tripod mounting collar

8Shoulder strap eyelet

9Focusing ring

10 Distance scale

11Distance scale index

12Aperture index dot

13Aperture indexing post for Nikon SB-E Speedlight

14Meter coupling ridge

15Aperturc-direct-rcadout scale

16Aperture ring

17 Aperture scale

FOREWORD

Belonging to a new generation of super-telephoto lenses, the Nikkor ED 800mm f/8 IF offers unparalleled image quality and handling ease, plus automatic diaphragm operation. The use of Extra-low Dispersion (ED) glass in the lens design drastically reduces chro- matic aberration (i.e., the inability of a lens to bring all wavelengths of visible light, especially red and blue, into the same plane of focus). The result is images that are crisp and virtually free of "color fringing" even when the lens is used wide open at its maximum aperture.

Nikon Integrated Coating (NIC) is applied to the surfaces of lens elements to reduce flare and improve contrast and color rendition.

For improved handling, this lens utilizes Nikon's Internal Focusing (IF) system, in which the lens elements are moved internally. Without the traditional focusing helicoid, there is no increase in the overall length of the lens as it's focused closer; thus, it is much easier to hand-hold. In addition, the lens is lighter and more compact than pre- vious models at the same focal length. Other convenient features include a built-in telescopic lens hood, built-in tripod mounting collar, presettable focusing ring for rapid refocusing to a certain distance, and full aperture through-the-lens metering with Al-type Nikon and Nikkormat cameras*.

The ED 800mm f/8 IF has special insertion-type filter holders accepting either 39mm screw-in or gelatine filters-the same type used with the Reflex-Nikkor 500mm f/8 and 1000mm f/11. Because of its long focal length, this lens is perfectly suited for a wide variety of situations, including photojournalism, sports and wildlife photography, as well as taking pictures of the sun and moon itself.

*When using this lens with non-AI cameras, exposure should be measured by the stop-down method. (For details, refer to your camera's instruction manual.)

MOUNTING ON A TRIPOD

For maximum picture sharpness and freedom from camera shake, the use of a tripod is recommended at all times. The Nikkor ED 800mm f/8 IF is incorporated with a sturdy, full rotatable (360°) built-in tripod mounting collar for just such purposes. To attach to the tripod, position the collar tripod socket on the tripod screw and tighten. To rotate the lens (with attached camera) for vertical or horizontal format, loosen the collar locking screw, rotate the lens to the desired position, and retighten the locking screw to secure the assembly. For convenience while positioning, index marks are provided at 90° intervals around the tripod collar.

PRESET FOCUSINGB

The focusing ring is fitted with a special ring for use when rapid refocusing to a specific object distance is desired; the click-stop action of the ring enables operation "by touch" for greater speed. To preset the lens, loosen the preset ring locking screw, rotate the focusing ring as far as it will go in either direction, turn the focusing ring back to the

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Nikon ED instruction manual Nomenclature, Foreword, Mounting on a Tripod, Preset Focusingb

ED specifications

Nikon ED (Extra-low Dispersion) optics represent a significant advancement in lens technology, specifically designed to enhance image quality by reducing chromatic aberration and improving color accuracy. These specialized glass elements are utilized in various Nikon products, including cameras, binoculars, and telescopes, making them a cornerstone of Nikon's optical engineering.

One of the primary features of Nikon ED glass is its ability to minimize the dispersion of light as it passes through the lens. Traditional glass can produce various wavelengths of light at slightly different focal points, leading to color fringing and a loss of sharpness in photographs. By incorporating ED glass, Nikon lenses achieve better focus across the color spectrum, resulting in more precise, vibrant images with greater detail.

The use of Nikon ED glass also enhances contrast and brightness. The superior optical properties of ED elements allow for increased light transmission, ensuring that images maintain their vibrancy even in challenging lighting conditions. This capability is particularly beneficial for wildlife and landscape photographers who often work in varied environments.

Another hallmark of Nikon ED technology is its durability. Lenses equipped with ED glass are typically constructed with robust materials, making them resistant to the rigors of outdoor use. Weather-sealed designs further protect against elements such as dust and moisture, ensuring reliable performance in a wide range of conditions.

In addition to its optical benefits, Nikon ED technology also incorporates advanced coatings, such as anti-reflective coatings, to reduce lens flare and ghosting. This enhancement allows for clearer, more defined images, particularly when shooting in backlit or high-contrast situations.

Nikon's commitment to precision engineering is evident in the meticulous design and manufacturing processes involved in creating ED lenses. Each lens is crafted with stringent quality control measures, ensuring that every product meets Nikon's high standards for performance and reliability.

In summary, Nikon ED technology exemplifies the brand's dedication to delivering superior optical performance. With its unique ability to counteract chromatic aberration, enhance light transmission, and withstand various environmental conditions, Nikon ED lenses are a preferred choice for photographers seeking unparalleled image quality and durability in their optical equipment.