Tokina 300mm f/2.8 AT-X 300 AF PRO
The AT-X
300 AF
PRO lens
features
the
exclusive
"Focus
Clutch
Mechanism.",
a
signature
of the
Tokina
PRO
series
lenses,
which
provides
a
faster,
smoother
auto
focus
operation
and a
smooth
manual
focus
action
not
normally
found in
today's
auto
focus
lenses.
As with
all the
lenses
in
Tokina's
AT-X AF
series,
the AT-X
300 AF
PRO is
constructed
using
all
aluminum
lens
barrels
and a
chrome-plated,
brass
mount
plate.
The
first
lens
group is
made
from two
elements
of high
quality
SD
(super
low
dispersion)
glass
that
minimizes
the
secondary
spectrum
caused
by
chromatic
aberration.
These
lenses
use FK01
and FK02
optical
materials
which
gives
them SD
(APO)
qualities.
The AT-X
300 AF
PRO lens
also
features
a
patented
IRF,
Internal
Rear
Focus
system.
This
system
moves
smaller
lens
groups
within
the lens
barrel,
which is
useful
for long
telephoto
lens
designs.
The IRF
system
has a
number
of
advantages
including
faster
auto
focusing
and more
compact
lens
design.
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