Canon EF 28-135mm lens
From Wikipedia, the free encyclopedia
| Canon EF 28-135 f/3.5-5.6 IS USM | |
 |
|
| Key features | |
|---|---|
| Maker: | Canon |
| Image stabilization: |  Yes |
| Ultrasonic motor: | Yes |
| Short back focus: |  No |
| Macro capable: | Yes |
| Application: | Standard telezoom |
| Technical data | |
| Type: | Zoom |
| Focal length: | 28-135 mm |
| Frame coverage: | Full frame |
| Aperture (max/min): | f/3.5-5.6 - f/36 |
| Construction: | 12 groups / 16 elements |
| # Diaphragm blades: | 6 |
| Close focus distance: | 0.5 m |
| Max. magnification: | 0.19 |
| Physical | |
| Max. diameter: | 78 mm |
| Max. length: | 97 mm |
| Weight: | 540g |
| Filter diameter: | 72 mm |
| Accessories | |
| Lens hood: | EW-78BII |
| Angle of view | |
| History | |
| Introduced: | february 1998 |
| Retail info | |
| MSRP US$ | 78,000 yen |
The Canon EF 28-135 f/3.5-5.6 IS USM, introduced in 1998, is a standard zoom lens with a high zoom ratio and 2nd-generation image stabilization (IS) technology to compensate for the effects of camera shake. The lens is based on the EF Lens Mount and will work with all film and digital EOS cameras that support this mount.
With the Image Stabilizer turned on, it is possible to obtain sharp pictures in dim lighting without using flash or a tripod. With the second generation of Image stabilization, it is reported to be possible to hand-hold the 28-135mm IS lens at 2 stops lower at the telephoto range and 1.5 stops at the wide angle range.
This lens features a ring-type USM that drives an internal lens group for swift, silent autofocus and allows full-time manual focusing (the ability to adjust the focus without disengaging the AF mode). A six-blade diaphragm is used. Closest focusing distance is 20 in. (50cm).
The Canon EF-S 17-85MM f/4-5.6 USM gives a similar field of view on APS-C digital cameras.
While the 28-135 has been the usual 'upgrade' lens replacing a kit lens e.g. EF-S 18-55, EF 28-80, Canon has not marketed an equivalent of an 'all-purpose' lens similar in performance to rival Nikon's 18-200 VR for their EOS digital cameras, leaving the 28-135 as an ideal upgrade. The reason for this - the EOS 5D has a full-frame format similar to a 35mm camera, and most of the professional-grade bodies e.g. EOS 1D, 1Ds use full-frame lenses as opposed to digital-only.
Since August 2007, the 28-135 is included as a kit lens with the Canon EOS 40D.
[edit] Other properties
- Front element does not rotate and the barrel does not expand or contract during focusing.
- Distance window in meters and feet for manual focusing.
- Best sharpness starts at f/6.3 at the short-end, always centers at f/8 and goes up to f/11 on the far-end.
- Weight: 540 g (18.9 oz)
- Filter size: 72 mm
[edit] Limitations
- Twist zoom action is prone to creep when pointed down.
- Weakest of most of the normal zooms in the flare and ghosting discipline, the additional lens elements used for IS may contribute flare and ghosting.
- Small amount of barrel distortion at the wide-end.
- Pincushion distortion at the long-end.
- The second-generation Image Stabilizer (IS) mechanism does not have the 'tripod detection' feature of later IS lenses. When mounted on a tripod or otherwise held still, the IS system goes into an audible feedback loop which may cause the IS to become erratic. The owner's manual advises the user to turn off IS when the lens is mounted on a tripod.
[edit] External links
|
|||||||||||||||||||||||||||||||||||||||||
