Specification Sheet

With eBANDWithout eBAND
Without uorine compensation With uorine compensation
4
Hybrid aspherical elements for spectacular build quality
and a compact design
ASL
Tamron lenses with the designation “aspherical” contain
several aspherical hybrid lens elements. These are designed
to all but completely remove imaging faults such as spherical
aberrations in Tamron high-performance zoom lenses. A hybrid
aspherical element can replace several other optical elements,
contributing to a compact form factor and equally high build
quality with all focal lengths and apertures. These innovative
optics produce the best possible image quality in a compact
form, all while retaining astonishingly large zoom ranges.
EXPAND YOUR
PHOTOGRAPHIC HORIZONS
BBAR - the key to rst-class image quality
The innovative BBAR (Broad Band Anti-Reection) multi-
layer compensation from Tamron ensures that light that
hits the surface of the lens is not reected or dispersed.
This means that loss of light and contrast are avoided and
ghost images are prevented. BBAR multi-layer compensa-
tion also ensures the best possible colour balance, which
results in natural and precise colour reproduction.
eBAND Anti-Reex Coating
eBAND
The nano-compensation process developed by Tamron
allows a wafer-thin coating (1nm = 1/1,000,000mm) to be applied
to the surface of the lens. The nano-structure has an ultra-low
refractive index and ensures excellent anti-reex properties
in combination with the multi-layer coating underneath. This
effectively minimises undesired mirroring and ghost images.
LD lens elements (Low Dispersion)
LD
LD elements reduce chromatic aberrations such as colour
fringes on the contrast edges and reduced image sharpness.
The cause of these optical image faults is light of different
wavelengths being broken at different points. Telephoto and
wide-angle focal lengths are most affected by this. LD glass has
a low colour dispersion index, which causes sharper imaging. The
lens elements effectively minimise unwanted colour fringes.
Camera compatibility
The designation Di (Digitally Integrated) refers to a lens
developed specially for the exacting requirements of
digital cameras. Please ensure when purchasing that the
lens has the correct mount for your camera system.
Di
For all DSLR cameras with full-format and
APS-C sensors
Di II
For DSLR cameras with APS-C
sensors
Di III
For mirrorless system cameras
Some models cannot be used with all mounts. You can nd an overview on pages 52
to 55. Di lenses with built-in motors for Nikon and Di II lenses have no aperture ring.
TECHNOLOGY
Schematic diagram of the chromatic aberration with a
normal optical glass (left) and an LD glass (right)
Normal
optical
glass
LD glass
Image planeImage plane
Tamron’s eBAND compensation effectively prevents mirror
images that can occur in back lit photographs as a result
of reections on the lens surfaces inside the lens.
Working mechanism of Tamron's eBAND coating (right)
compared with a standard coating (schematic diagram).
Comparison of the partial dispersion factors with a normal
optical glass (left) and an AD glass (schematic diagram)
XLD (eXtra Low Dispersion) glass
XLD
XLD elements are made from high-performance optical
glass with an extremely low colour dispersion index. Its refractive
properties are similar to those in high-grade uorite. This effectively
prevents problematic chromatic aberrations. This means maximum
image sharpness will be achieved, even at the edges of the photo.
Legend - Lens construction (see lens designs in this brochure)
Hybrid-aspherical lens LD element XLD element AD element XR element UXR element Aspherical ultra-precision pressed glass
Relatively even partial dispersion ratio.
Extremely high partial dispersion ratio
relative to a specic range of wavelengths.
AD glassNormal optical glass
Super Performance – for discerning photographers
SP
Tamron’s SP Series (Super Performance) meets
the highest standards in photography. The lenses are
built to precise specications to meet the demands of
professional photographers, with emphasis on the highest
possible build quality. Tamron doesn’t compromise in
quality or cost - we shoot for superior performance in every
respect. The result is a range of lenses marked by impres-
sive, innovative product design. Those looking for stellar
performance need look no further than Tamron’s SP lenses.
XR and UXR special glass for higher performance and more
compact lens construction
XR UXR
XR (eXtra Refractive Index) and UXR elements
(Ultra eXtra Refractive Index) are optical glasses with a
very high refractive index. Their properties allow a shorter
overall length and therefore lighter lenses with smaller
diameters, without changing the aperture size.
AD elements (Anomalous Dispersion)
AD
Optical lenses with an abnormal level of dispersion
make a signicant contribution to reducing colour fringes
(chromatic aberrations) at high light frequencies and improve
overall imaging performance. The combination of AD glass
elements with difference lenses made from normal optical
glass makes it possible to control light dispersion at specic
wavelengths. Axial and lateral aberrations, which can be a
particular problem when using telephoto lenses or wide-
angle lenses, can be signicantly reduced in this way.
Compensation for distortionCompensation for
spherical aberrations
aspherical surface
Light's refractive quali-
ties mean that incident
light rays that are not
corrected can cause
distortions. Tamron’s
aspherical construction
principle continuously
balances these light
rays’ angle of refraction.
spherical surface
corrected light rays on
the sensor level
uncorrected light rays
on the sensor level
Image planeImage plane
Image planespherical (normal) lens
aspherical lens
Compensation effect in a lens with an aspherical element
(schematic diagram).
TECHNOLOGY
Multi-layer coating
Multi-layer
coating
Nano-structured layer
Incident light Incident light
Reected light Reected light
5
Fluorine compensation
FLR
Fluorine compensation was developed for optical systems
in industrial production. It provides long-term protection to
the front lens against oil and water. Any soiling won’t stick
to the surface - you will be able to wipe it away easily.