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Overview: The Tamron AF
17-50mm F/2.8 XR LD Aspherical IF (Model A16E) is an accessory
lens, specifically designed for use with Canon digital SLR
cameras. It has the standard Canon EF mount.
Compatibility: This lens is
compatible with Canon digital SLR cameras.
Zoom: This 17-50mm lens has a
3x zoom capability. When converted to the 35mm film format, the zoom yields
the equivalent of a 26-78mm zoom range.
SP-Series Lens: Tamron's SP (Super Performance) series is a
line of high performance lenses with high design specifications. This series of
lenses featuring impressive and innovative design are concept models among
Di II: Tamron Di II lenses are
designed to fit digital SLR cameras with smaller-size image sensors. This series
of lenses should not be used on 35mm film format cameras and digital SLR cameras
with image sensors larger than 24mm x 16mm. When used on film cameras and
digital cameras with larger sensors, vignetting (or darkening of the corners of
the image) occurs.
Optical Features: This lens has
the following optical features:
- Anomalous Dispersion Glass (AD):
Anomalous Dispersion glass is a special optical glass that, when combined
with normal glass elements, allows the lens to provide unparalleled optical
quality while eliminating chromatic aberrations that can denigrate image
contrast and sharpness.
- Aspherical Elements (ASL):
The use of Tamron's exclusive Hybrid Aspherical elements provides the
ultimate in compactness and image quality.
- Low Dispersion Glass (LD):
The use of Low Dispersion (LD) glass elements greatly reduces the effect of
chromatic aberration, a form of optical noise, and dramatically increases
- Internal Focusing (IF):
Tamron's Internal Focusing System enhances lens maneuverability and reduces
the Minimum Focus Distance (M.F.D.) throughout its entire focal length.
- Extra Refractive Glass (XR): Through the innovative use
of XR (Extra Refractive Index) glass, the overall size (diameter and barrel
length) of the lens was reduced, while maintaining the same aperture values
as previous lenses.
Lens Hood: A bayonet-type lens
hood is provided with the lens. The lens hood prevents stray light from entering
the lens, which can be harmful to the picture. When not in use, the lens hood
can be inverted and stored on the lens. The lens hood adds approximately 1-1/2"
length to the lens. Note: Using the camera's built-in flash with the lens
hood in place can cause shadows to appear on the image.
Focus Modes: The lens can be
used in either Automatic or Manual Focus modes. When you switch the camera to
manual focus, you can focus on your subject by rotating the focus ring on the
Manual Zoom: You can manually
zoom in or out by rotating the zooming ring of the lens while viewing your
subject through the camera's viewfinder and compose your image at the chosen
- Focal Length: 17-50mm
- Maximum Aperture:
- Minimum Aperture:
- Angle of View:
- Diagonal: 78˚45' -
- Horizontal: 68˚37' -
- Vertical: 49˚1' -
- Lens Construction: 16
elements in 13 groups
- Minimum Focusing Distance:
10.6" (0.27 meters) across the entire zoom range
- Macro Magnification Ratio: 1:4.5 (at f=50mm MFD 0.27m)
- Filter Size: 67mm
- Length: 3.595"-4.689" (w/
lens caps 4.122"-5.213")
- Diameter: 2.865"
- Weight: 15.2 ounces (430 grams)