Tamron 70-350mm F/4.5 Model 05A: The 70-350 F/4.5 was
expensive and was designed for specific applications such as daytime aviation,
sports and nature photography, and surveillance work. It abolutely has to be
tripod mounted due to its size and weight. We have absolutely no idea how well
this lens performs optically, but have found several positive comments and
reviews by owners which are posted on the Internet. This lens features a
revised optical design compared to the earlier Adaptall 70-350mm F/4.5 model
CZ-735 lens. The front focus and master lens groups were also revised compared
to the earlier CZ-735 optical design. Tamron states that this lens uses high
refractive index glass elements in both the variator and compensator groups for
sharp images across the field of view. These changes, in conjunction with the
new high refractive index glass for the variator and compensator groups, lead
us to believe that this lens has very little chromatic aberration. Off-axis
performance should be fairly good since this lens features a large and
conventional optical layout which makes it easier for the optical designer to
control off-axis aberrations. Also note that the six element master lens group
possesses very low optical power and mostly functions to correct off-axis
aberrations and field curvature. Although this lens is large and heavy, it
likely has somewhat above average optical performance.
Lens Specifications:
Lens Model |
05A |
Focal Length |
70 350mm |
Aperture Range |
f/4.5 32, AE |
Angle of View |
34°~7° |
Optical
Construction (Groups / Elements) |
13 / 15 |
Min. Focus from Film
Plane |
98.4" (2.5m) |
Macro Mag.
Ratio |
|
Filter Size |
82mm |
Diameter |
3.5" (90mm) |
Length at
[w/Nikon mount] |
10.8" (274mm) [11.0" (278.5mm)] |
Weight |
76.5 oz. (2170) |
Lens Hood |
Built-in type, retractable. |
Accessory |
Accepts SP 2X tele-converter #01F. Supplied
with exclusive tripod mount ring. |
|