Nikon F3AF instruction manual Focus------------------------------~

FOCUS------------------------------~

The Nikon F3AF features a through-the-Iens autofocus system which takes the guesswork out of focusing : just point the camera at what you want to photograph, depress the shutter release button @ halfway, and watch the subject literally 3nap into sharp focus ... automatically.

The system consists of three parts: the special F3AF camera body, the AF Finder DX-1, and an AF-Nikkor lens, either the 80mm 1/2.8 or the 200mm 1/3.5 IF-ED . The AF Finder DX-1 is interchangeable and covers approx. 92 % of the image area of the actual photograph, meaning that the final photograph will be larger than the image seen in the viewfinder. The focusing screen is built into the bottom of the viewfinder and cannot be interchanged . However, when other Nikon F3 interchangeable viewfinders are used with the F3AF, you have a choice of 20 interchangeable focusing screens (refer to page 55).

Nikon'sautofocus system is unique in that it features exception- ally quick response, allowing you to keep up with active, fast- moving subjects.

The Nikon F3AF offers you three different ways of focusing:

1)autofocus, 2) focus -aid operation (using the focus indicators inside the finder), or 3) manual focus (using the matte portion of the focusing screen). As shown in the following table , however, only AF-Nikkor lenses are usable for autofocus. With other lenses having maximum apertures of 1/3.5 and faster, you can use the focus indicators as a guide in focusing as you manually rotate the lens focusing ring (

Note: Because of the cropping which occurs in the case of mounted slides or regular snapshot-size prints, the actual picture might come out slightly smaller than the image seen in the viewfinder.

Usable Lenses

Focusing method	Lens
Autofocus	AF-Nikkor 80mm f/2 .8, AF-Nikkor 200mm f/ 3.5
	IF-EO

Focus -aid operation Nikkor (including AF-Nikkorl and Nikon Series

	E lenses with a maximum aperture of f/3 .5
	or faster
Manual focus	Nikkor (including AF-Nikkor) and Nikon Series
	Elenses

Notes:

1)Even with lenses slower than fI3.5, the focus indicators willligM up when the shutter release button is depressed halfway. This indication, however, is not reliable.

2)Although the following Nikkor lenses have a maximum aperture of f13.5 or faster, they cannot be used for focus -aid operation: 16mm fI3.5, 20mm fI3.5, 28mm fI3.5, 135mm fI3.5, Micro 55mm fI3 .5, PC 28mm fI3.5, PC 35mm fI2.8, and PC 35mm fI3.5; the Micro-Nikkor 55mm f12.8 cannot be used at closer than 280mm; the Zoom -Nikkor 35- 105mm fI3.5 -fI4 .5 can be used only at 35mm zoom setting.

3)When the Nikon Teleconverter TC-14, 200 or 300 is attached to the lens and it makes the lens' effective aperture slower than fI3.5, the camera's autofocus and focus -aid operation cannot be used.

4)The following lenses cannot be mounted on the F3AF with the OX-1 Finder: .Nikkor 13mm fI5.6, Reflex-Nikkor 500mm f18, and Reflex- Nikkor 1000mm fill .

5)Certain filters cannot be used for autofocusl focus-aid operation. (For details, please refer to page 64)

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