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Nikon F3AF instruction manual WhatlsEV?, How to Read the EV Chart, Full-aperture metering

Models: F3AF

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EVRANGEOFCAMERA---------------------

The camera's meter may be used only within the shutter speed range covered by the exposure value (EV) range of the meter, which varies with the aperture and ASAIISO setting .

The charts on pages 68 and 69 show the relationships between the f/stop, shutter speed and film speed, indicating the usable functioning shutter speed (for metering purposes) with any film speed/aperture combination .

Careful attention to the following instructions will assure precise exposure, automatically, over the complete exposure control and meter range capabilities of your Nikon F3AF.

WhatlsEV?

Exposure value (EV) is a number representing the available combinations of shutter speed and aperture that give the same exposure effect when the scene brightness and ASAIISO re- main the same.

At ASAIISO 100, the combination of a one-second shutter speed and an aperture of f/1.4 is defined as EV 1. If the aperture is stopped down by one full f/stop or the shutter speed is one step faster, the EV increases by one ; if the aperture is opened up by one full f/stop or the shutter speed is one step slower, EV decreases by one. Using ASAIISO 100 as an example, 1 sec. at f/2 represents EV 2, 1 sec. at f/5 .6 represents EV 5, while 1/125 sec . at 1/5.6 represents EV 12. Because the exposure is the same, 1/30 sec. at f/11 and 1/1000 sec. at f/2 both represent EV 12.

How to Read the EV Chart

Section A of the chart shows the usable EV range depending on the lens'maximum aperture in full -aperture metering , while it also indicates the usable EV range for aperture settings in stop -down metering . Section D shows the value for the ASAIISO film speed, Section B the aperture settings for various film speeds, and Section C the shutter speeds to match any film speed/aperture combination .

In practice, you will find that it is generally the high end and the low end of the metering range which require a careful check. The EV range of the Nikon F3AF encompasses most lighting situations, and it is only under very dim or very bright picture- taking situations that you need pay any special attention .

Full-aperture metering

Use the Nikkor 50mm f/1.4 lens and a film speed of ASAIISO 100 as an example. By referring to the f/1.4 column in Section A and the EV value indicated for ASAIISO 100 in Section D, you will find that the F3AF'sEV range in this case is 1 to 18.

If the lens is set at f/5.6, refer to Section B and single out the f/5.6 indication for ASA/ISO 100. Go diagonally down until the protruding line intersects with Section C'svertical line for a shutter speed of 8 sec. (the F3AF'sslowest shutter speed). From this point of intersection, follow the horizontal line that leads to the Section D'sEV value for ASAIISO 100, and you will obtain an EV range of 2. Start again from the f/5 .6 indication

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Page 65 Page 67
Page 66
Image 66
Nikon F3AF instruction manual WhatlsEV?, How to Read the EV Chart, Full-aperture metering
Page 65 Page 67

F3AF specifications

The Nikon F3AF, introduced in 1983, is a landmark camera in the history of photography, notable for its pioneering autofocus capabilities. As one of Nikon's first professional autofocus cameras, the F3AF combines the robust features of the F3 series with advanced technology to offer photographers a powerful tool for capturing high-quality images.

One of the standout features of the F3AF is its autofocus system, which employs a sophisticated phase detection mechanism. This represents a significant leap forward from the manual focus cameras that dominated previous generations. The system can quickly and accurately lock onto subjects, making it easier for photographers to capture sharp images, particularly in dynamic or fast-paced situations.

The F3AF retains the iconic design and build quality of the F3, characterized by its rugged, weather-sealed construction that ensures durability in various shooting environments. The camera body features a comfortable grip and a solid metal chassis, appealing to professionals who require reliability and performance in the field.

Another key characteristic is its compatibility with a wide range of Nikkor lenses, including the autofocus Nikons. This flexibility allows photographers to choose the appropriate lens for their specific needs, whether they are shooting landscapes, portraits, or sports. The camera features a unique "Auto Focus" mode which works in tandem with specialized AF lenses to streamline the focusing process.

In terms of exposure modes, the F3AF offers automatic exposure through its TTL (Through The Lens) metering system. This capability allows for accurate exposure readings, helping photographers achieve optimal results in various lighting conditions. Additionally, the camera features multiple shooting modes, including manual, aperture priority, and shutter priority, accommodating the preferences of both novice and seasoned photographers.

Furthermore, the F3AF supports an array of accessories, including motor drives and special viewfinders, allowing photographers to enhance their shooting experience. The camera's electronic viewfinder provides a bright and clear display, giving users a precise view of their composition.

Despite being released decades ago, the Nikon F3AF remains a respected choice among film enthusiasts and collectors, representing a significant achievement in photographic technology. Its blend of innovative autofocus functionality, robust design, and versatile features make it an enduring symbol of Nikon's commitment to excellence in the world of photography.