Nikon Camera F3AF - Manual (Page 99)

focusing in ciose-up photography, the use of a suitabie inter­
changeable focusing screen and accessory viewfinder is
recommended.
When using close-up equipment such as a bellows unit or exten­
sion ring(s) attached between the F3AF camera body and
lens, focus-aid operation depends on lens extension from the
camera’s mounting flange, as shown in the following table.
Lenses from
24mm to 50mm
Lenses from
56mm to 85mm
Lens maximum
aperture
Maximum permissible extension
of lens for focus-aid operation
f/1.2, f/1.4 Twice the tens focal length
f/1.8, f/2 Four-fifth of the lens focal length
f/2.5, f/2.8 One-half the lens focal length
f/1.2 Twice the lens focal length
f/1.4 Four-fifth of the lens focal length
f/2 One-half the lens focal length
f/2.8 One-fifth of the lens focal length
For lenses not appearing in this list, focus-aid operation is im­
possible with any close-up equipment attached. In addition,
focus-aid operation cannot be performed when a lens is mounted
in the reverse position.
Notes:
1) The F3AF's meter coupling lever ® should be pushed up before at­
taching a bellows unit or non-AI extensior: rings, such as the PK-1, 2,
3.PN-1, etc.
2) Before attaching the PB-6 to the F3AF, the DX-1 Finder should be first
removed from the camera body.
3) Auto Extension Rings PK-1 and PK-11, Extension Ring K1 and Auto
Adapter Ring BR-4 cannot be attached to AF-Nikkor lenses.