28-300 is the zoom length from 28mm to 300mm
f3.5-6.3 is the aperture range where it is
f3.5 at 28mm and f6.3 at 300mm
The codes below explain all the other letters
DG IF ASP MACRO
||Aspherical Lens Elements. A
type of lenses that virtually eliminates the problem of coma and other types
of lens aberration. The are particularly good at correcting distortion in
wide-angle lenses as well as contributing to a lighter and smaller lens
||Apochromatic lenses. Uses
special low dispersion glass for minimum colour aberration and telephoto
quality improving contrast and sharpness. APO Zoom Marcos offer up to 1:2
magnification (one half lifesize) in the telephoto range with instant
shifting from normal to macro shooting. APO Tele-Macros offer a 1:2 image
size close focus, when the macro switch is engaged the zoom control ring is
fixed at the telephoto end.
||These lenses can be used with
the APO Teleconverter EX. It can increase the focal length and will
interface with the cameras automatic exposure function.
||Lenses which have been
designed so that the image circle matches the smaller size of the image
sensor of most Digital SLR's. Also compact and lightweight.
||Large aperture lenses with
wide angles and short minimum focusing distances. Have peripheral
illuminations so are the ideal lenses for Digital SLR cameras, but are still
suitable for 35mm SLR's.
||Dual Focus. Disengages the
linkage between the internal focusing mechanism and outer focusing ring when
in the AF position. Allows holding of the lens as the focusing ring does not
rotate during auto-focusing, but gives adequate focusing torque of the focus
ring when manually focusing the lens.
||Deluxe. Full featured lenses
and come with a custom lens hood, feature half stop increments on manual
aperture settings, depth of field scale, distance scale, infrared correction
||Excellence. Used to define
professional type lenses, it denotes a superior build and optical quality.
||Helical Focus. Eliminates
front lens rotation, allowing the use of a perfect hood and easy to use
||Hypersonic Motor. Uses a motor
driven by ultrasonic waves to provide quiet, high-speed Auto Focus.
Virtually silent, highly responsive auto and manual focusing.
||Inner Focus. The lens is
able to focus without physically changing its size, where optical movement
is limited to the interior of the non-extending part of the lens barrel,
allowing for a more compact and lightweight lens as well as closer focusing
||Used on those lenses which
have the ability to be used for close up (macro) photography. Some will have
a magnification ratio of 1:3 focusing at 50cm, such as some of their
standard Zoom lenses like the
DG MACRO or 1:2 at 95cm for some of their
telephoto zooms, like the 70-300mm f/4-5.6
DG MACRO or 1:1 at 31.3cm for their dedicated macro lenses such as the
105mm f/2.8 EX DG
||Optical Stabilizer. Has a
built in mechanism that compensates for camera shake. Alleviates
camera movement when shooting by hand held camera.
||Rear Focusing. A system were
all the lens elements are divided into specific groups, with only the rear
group moving for focusing, making the auto-focus operation smoother and
||Ultra Compact. The smallest,
lightest lens of it's type.