V1.02
Thom Hogan’s Complete Guide to the Nikon D300
Page 369
*See “Questions and Answers” on page <766>
Some people wonder why you can’t use the Shutter priority
and Program exposure modes with AI and AI-S lenses. That’s
because apertures on these lenses close down in a variable
fashion and the camera doesn’t know what that variability is
for the particular lens that’s on the camera.
In addition, several broad caveats apply when using certain
types of lenses or accessories:
• PC
Nikkor
—exposure reading must be taken and set
(locked) with the lens in a non-shifted position.
• Teleconverters
—the effective aperture must be f/5.6 or
faster for autofocus and viewfinder focus confirmation to
work. AF-I type converters otherwise have the same
compatibility as AF-I type lenses (i.e. full), while older AI
type converters have the same compatibility as AI type
lenses (i.e. limited). TC-xxE converters have the same
compatibility as AF-S lenses.
• Bellows and extension tubes
—have the same
compatibility as AI type lenses, and the effective aperture
must be f/5.6 or faster for viewfinder focus confirmation to
work.
Finally, some individual lenses have additional limitations:
• TC-16S AF Teleconverter
is incompatible and shouldn’t be
used.
• Non-AI lenses are incompatible
,
may cause damage to the
camera
, and you shouldn’t attempt to mount one on the
camera (note that most non-AI lenses can be converted to
AI).
• Lenses that require the AU-1 focusing unit
(e.g. the Nikkor
400mm f/4.5, Nikkor 600mm f/5.6, Nikkor 800mm f/8,
and the Nikkor 1200mm f/11) are incompatible and
shouldn’t be used.
• Fisheye lenses whose rear element sticks into the mirror
box and that require mirror lockup
(e.g. the Nikkor 6mm
