Canon Wide Angle Lenses
Throughout the history of cameras, wide angle lens, also called wide angle zoom lens or ultra wide angle lens, has been in the pursuit of shorter focal length and a broader perspective, especially when the standard zoom lens from wide-angle35mm,28mm down to24mm, the expansion has become the ultra wide-angle focal lengths the inevitable development of wide-angle zoom lens.
In April 1996, Canon introduced the EF 17-35mmf/2.8LUSM lens, Canon is the first one less than the20mmwide-angle end of zoom lens, the f/2.8 aperture value and ultra-wide-angle fixed focus lens is no different. Had made several 20-35mmzoom lens is only 1.75x magnification,20mmphotographers apparently difficult to meet the growing ultra-wide-angle requirements. EF17-35mmf/2.8LUSM uses two aspherical lenses, ring USM and Internal Focusing technology, and performance in the film era of focal lengths have been professional users and photography enthusiasts affirmed.
The twenty-first century, EF 17-35mmf/2.8LUSM and all of the last century, like the birth of the lens, began to be the challenge of digital photography, in addition to its closest focusing distance and other performance appears to lag behind. Canon in December 2001 launched its follow-up model EF 16-35mmf/2.8LUSM, through three aspherical lens and two UD lenses to enhance the performance, became the shortest focal length lens (although this record is only maintained 2 years), it also meets the performance of digital and film SLR camera usage.
In April 2007, the release of the top digital SLR Body EOS-1D Mark III at the same time, Canon has introduced a EF 16-35mmf/2.8 LUSM upgrade products EF16-35mmf/2.8LII USM, wide angle for the edge before the lack of imaging, improved front-end part of the design of the lens group, to better correction of various aberrations, to obtain a more superior edge of the image, meet the most demanding professional users.
Focal length less than16mmultra wide-angle lens to give us a vision of the human eye is far beyond the new world. A wider range of scenery can be imaged, due to the strong deformation effect, subject Shape itself with our direct observation with the naked eye the difference. Such a strong personality, is the charm of ultra wide-angle lens, and only used it for people to really understand its charm. Let’s enjoy the numerous photographers who dumped a unique charm.
1. Lens focal length conversion factor of the wide-angle end of the most obvious
Compared with35mmfull-frame camera, APS-C size camera focal length conversion factor of approximately 1.6 times. Photos can be found all through the lens of perspective is narrowed. When using the camera enough to capture full-frame to the foot of the14mm,15mmlens level, angle it into the equivalent of22mm,24mmfocal length, photos, results were mediocre. In contrast, for APS-C size cameras designed EF-S 10-22mmf/3.5-4.5 USM lens imaging is of great advantage, even if the lens by 1.6 times the conversion coefficient, has also been a full-time equivalent under the16mmformat camera perspective. APS-C size cameras can use all EF lenses, but in the ultra wide-angle lens, we estimate not able to go beyond the EF-S 10-22mmf/3.5-4.5 USM combination.
2. Stimulate lens hidden charm, 35mm full-frame camera
35mmfull-frame camera can take full advantage of all the original angle EF lenses, the use of wide-angle lens can experience the shocking sense of perspective. EF-S 10-22mmf/3.5-4.5 USM is the EF-S lenses can not be used. “EF15mmf/2.8 fish eye” lens to play out of the inherent characteristics of the fish-eye lens, which fully reflects with EF14mmf/2.8LII USM differences. Using APS-C size cameras, leading to four weeks because some of the focal length conversion to be cut off, making the “EF15mmf/2.8 Fisheye” lens imaging has become an ordinary wide-angle lens with image similar. Full-frame image sensor One of the advantages is the ability to play 100% of surplus wide-angle lens “flavor.”
3. Only a few millimeters difference would be a great impact on the world of ultra-wide angle
Lens focal length units in mm (millimeters). But the ultra-wide angle lens, the only1mmdifference will have a significant impact on the viewing angle. In the298mmfocal length and300mmtelephoto focal length of the side of the image capture would have little effect, while the14mmwide-angle end and16mmfocal length focal length is completely different, it will produce about 6 degrees viewing angle is poor, this can obviously from the photo seen. Therefore, ultra-wide angle lenses need to be able to effectively play the role of the camera with the use of perspective. Canon EF lenses can be used for any SLR camera, but if you want to be able to give full play to EF14mmf/2.8LII USM, EF 16-35mmf/2.8LII USM lens is inherent in these two perspectives and imaging features, then recommend or with able to play 100% full-frame lens performance using camera image sensors used in combination.