| Tamron
SP
17-35mm f/2.8-4
Di AF zoom lens
by Paul Fisher
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|
OVERVIEW
The
Tamron 17-35mm f.2.8~4 wide angle zoom lens is a recent addition
to the Tamron line-up. To give it its full title, the lens is
the Tamron SP AF17-35mm F/2.8-4 Di LD Aspherical [IF] Model A05
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Tamron
SP AF 17-35mm F/2.8-4 Di LD Zoom Lens |
Unscrambling
the alphabet soup indicates that this is a high-tech optic:
-
SP
- Designation given to Tamron's top line of lenses
.
-
Di
- Digitally optimised lens, with reduced chromatic aberrations,
and improved rear element coating to reduce back-scatter
of light from the digital sensor. (Note that unlike the
Dx Nikkors which have a reduced image circle for the small
APS sized Nikon sensors, Tamron's Di series have an image
circle sufficient for the full 36x24mm frame of a 35mm
camera).
.
-
LD
- Low Dispersion glass for improved sharpness and contrast.
.
-
Aspherical
lens element(s) for reduced aberrations.
.
-
IF
- Internal focusing - the length of the lens does not
change, and the front element does not rotate while focusing.
This
review arises from approximately two week's use of the lens
in a wide variety of settings. However, no formal classical
testing was undertaken. Rather, the results are from my
subjective experience and the results of "real world" pictures
taken.
SPECIFICATIONS
| Model
name |
A05 |
| Focal
length |
17-35mm |
| Maximum
aperture |
f/2.8-4
|
| Angle
of view |
104°-63°
|
| Lens
construction |
14
elements in 11 groups, including 3 aspherical and
1 LD glass element |
| MOD
(minimum object distance) |
0.3m
(11.8") throughout entire zoom range |
| Maximum
magnification ratio |
1:5.4
(at 35mm) |
| Filter
size |
77mm
|
| Overall
length |
86.5mm
(3.41") |
| Maximum
diameter |
83.2mm
(3.28") |
| Weight
|
440g
(15.5oz) |
| Number
of diaphragm blades |
7 |
| Minimum
aperture |
f/22
|
| Standard
accessory |
Flower-shaped
hood |
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