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Tokina 28-80mm f/2.8 AT-X 280 AF
PRO Wide Angle-Telephoto Zoom Lens
The
AT-X
280
AF
PRO
is
constructed
with
high
quality
optical
glass
multicoated
lens
elements
created
by
Hoya
Corporation,
the
world's
largest
manufacturer
of
optical
glass.
Two
Aspherical
lens
elements
and
one
SD
(super
low
dispersion)
glass
element
are
employed
in
the
optical
design
to
insure
critical
sharpness
across
the
film
plane.
One
aspherical
element
is
molded
as
one
piece
of
optical
glass
created
with
technology
pioneered
by
Hoya.
The
other
is a
hybrid
aspherical
element.
An
internal
focusing
mechanism
with
a
Tokina
Focus
Clutch
Mechanism
gives
this
lens
fast
auto
focus.
The
focus
clutch
feature,
a
signature
of
the
Tokina
PRO
series
lenses,
allows
the
manual
focus
ring
to
be
snapped
forward
to
an
auto
focus
position.
This
disengages
the
ring
from
the
focus
gearing
and
provides
a
faster,
smoother
auto
focus
operation.
When
snapped
back
to
the
manual
focus
position,
the
ring
is
damped
for
a
smooth
manual
focus
action
not
normally
found
in
today's
auto
focus
lenses.
A
refinement
of
the
focus
clutch
mechanism
has
been
incorporated
in
the
AT-X
280
AF
PRO
Nikon
and
Canon
mount,
so
that
now
the
lens'
focus
ring
can
be
snapped
back
to
the
manual
focus
position
at
any
time.
This
improvement
means
it
is
not
necessary
to
change
the
AF/MF
switch
(on
the
body
with
Nikon
or
the
lens
with
Canon)
every
time
the
lens
is
changed
from
auto
focus
to
manual
focus
mode.
Internal
focus
means
the
77mm
filter
threads
do
not
move
during
focusing.
The
advantage
is
when
a
special
effects
filter
is
used
it
is
not
necessary
to
readjust
the
position
of
the
filter
every
time
the
focus
is
changed.
A
window
has
been
added
to
the
AT-X
280
AF
PRO
that
shows
a
distance
scale.
This
makes
it
possible
to
tell
the
focusing
distance,
regardless
of
the
actual
setting
of
the
focus
mode.
Like
the
rest
of
the
lenses
in
the
AT-X
series,
the
AT-X
280
AF
PRO
is
what
is
commonly
referred
to
as a
parfocal
lens.
This
means
that
if
focus
is
achieved
at
80mm,
then
the
lens
is
zoomed
back
to
28mm,
the
subject
will
still
be
in
focus. |
|
Construction |
11
Groups/
16
Elements |
|
Angle
of
view |
75°
20'
to
30°
20' |
|
F
stop
range |
f/2.8-f/22 |
|
Closest
Focusing
Distance |
1.6
ft.
(0.5m) |
|
Maximum
Magnification |
1:5 |
|
Filter
Size |
77mm |
|
Dimensions
(Length
x
Diameter) |
4.5
in.
(120mm)
x
3.3in.
(84mm) |
|
Weight |
28.6
oz.
(810g) |
|
Notes |
1 SD
glass
element
Internal
focusing |
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