the STM STM the EF 40mm f/2.8 EF-S 18-135mm f/3.5-5.6 the IS
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left and upper right: Use the EF 40mm f/2.8 STM shooting
lower right: the STM using the EF-S 18-135mm f/3.5-5.6 the IS shoot
concern points
EF-S 18-135mm f/3.5-5.6 the IS STM and EF 40mm f/2.8 the STM
■ The newly developed optical system to achieve high-definition technology. Servo AF with the EOS 650D video high-magnification zoom lens EF-S 18-135mm f/3.5-5.6 the IS STM
the EF-S 18-135mm f/3.5-5.6 the IS STM is a high-magnification zoom lens, installed on the EOS 650D video servo auto focus during movie shooting for quiet, smooth automatic focus tracking. This lens with APS-C frame EOS Digital SLR cameras, covering the equivalent of about 29-216mm in 35mm format conversion perspective. Efficient allocation of a large UD (ultra low dispersion) lens and high-precision aspherical lens, the aberration produced by a variety of compensation zoom. New six-group lens zoom structure, shorten the closest focusing distance and the miniaturization of the lens. The AF drive equipped with a STM stepper motor lead screw unit. Internal focus mode to drive the focus lens can be quickly and easily complete the focus. Zoom STM stepper motor will continue to control focus lens, you can keep the focus state to change the camera angle. The movie shooting with the EOS 650D to take advantage of video Servo AF continuous focus on the subject. As a result of the electronic focus ring can be smooth manual focus and focus is accurate, the corresponding full-time manual focus. Equipped with a hand-shake compensation mechanism compensation effects (equivalent to approximately four shutter speed when shooting still images) IS Image Stabilizer. Dynamic image stabilization in movie shooting function, compensation walking prone to shooting a movie substantial jitter suppression screen shaking shooting image smoothly. In addition, seven blade circular aperture, can be sold for a substantial soft blur effect. About 7.5-times zoom ratio can correspond to a wide range of scenes, the use of 35mm format conversion is equivalent to about 216mm at the telephoto end can also enjoy the fun of sports photography is a high-magnification zoom lens can be active in a variety of shooting the scene.
hand-shake compensation effect of sample
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hand-shake compensation mechanism IS Image Stabilizer open & hand-shake compensation mechanism IS Image Stabilizer off
※ the STM due to the EF-S 18-135mm f/3.5-5.6 the IS electronic focus ring, attached to the camera, if not turn the camera on, you can not focus.
■ STM stepper motor-driven autofocus, corresponding to a full frame of thin lightweight biscuit lens EF 40mm f/2.8 STM
the EF 40mm f/2.8 the STM corresponds to the whole frame of thin, lightweight standard fixed focus lens. The maximum diameter of about 68.2 mm, 22.8 mm thick, weighing about 130 grams, EF lenses now on sale is the most thin and light, are called biscuits lens fixed focus lens. The optical system into the new technology of the Canon R & D, to carrying GMo (glass molded aspherical) lens height to cover a variety of aberrations, are available from the center to the periphery stable quality. STM stepper motor-driven autofocus. The STM stepper motor has a simple mechanical structure and accurate control, and use its features to achieve the miniaturization of the lens. Convenience during movie shooting with the EOS 650D with AF Tracking, the use of video-servo AF while shooting a movie with quiet, smooth focus. Electronic focus ring in manual focus can also be smooth precision in focus, but also supports full-time manual focus. Canon developed its own optical design to achieve a F2.8 bright and large aperture, with a seven-blade rounded diaphragm effect, be able to shoot a beautiful blur. Compact size and portable, suitable for use in the capture and other shooting, and the blur effect is excellent, and also specializes in portrait photography. Flexibility in the use of about 0.3 m closest focusing distance (approximately 0.18 times the maximum magnification) can be taken close-up. This is a wide range of uses fixed focus lens can be used for a variety of shooting situations.
the EF 40mm f/2.8 the STM comes with the hood ES-52
* STM using electronic focus ring, the EF 40mm f/2.8 attached to the camera, if not turn the camera on, you can not focus.
■ with the lens features a newly developed two kinds of STM stepper motor-driven autofocus in movie shooting power play
the STM of the EF-S 18-135mm f/3.5-5.6 the IS and the EF 40mm f/2.8 AF STM drive uses a the STM stepper motor. STM stepper motors and electrical pulses synchronized action, to receive an electrical pulse signal to turn a fixed angle, obtained according to the action of the increase or decrease of the pulse signal to control the motor rotation, start, stop a good response. The feature is driven by a simple mechanical structure. Unlike most small digital camera lens motor so use a lot of reduction gear, easier to achieve the miniaturization of the drive unit. Due to inhibition of the action when the autofocus sound suitable for movie shooting. According to the characteristics of the lens, Canon developed two STM stepper motor unit. EF-S 18-135mm f/3.5-5.6 the IS the STM “STM + lead screw type” unit will STM rotation of the stepper motor power directly to the lead screw, a simple mechanical structure to achieve a quiet, smooth automatic focus drive. In addition, the EF 40mm f/2.8, the STM equipped with STM + gear-type “units, the deceleration of the integration of control and STM stepper motor output gear to focus. STM + gear type unit can achieve a compact design, suitable as a small lens drive. Corresponding to these two new actuator using a new AF algorithm can easily complete the shooting of still images and video clips.
STM structure schematic
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the EF-S 18-135mm f/3.5-5.6 the IS STM equipped with STM + lead screw unit
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equipped with the EF 40mm f/2.8 the STM STM + gear unit
the STM
EF-S 18-135mm f/3.5-5.6 the IS and EF-S 18-135mm f/3.5-5.6 the IS specification table
| EF-S 18-135mm f/3.5-5.6 IS STM | EF-S 18-135mm f/3.5-5.6 IS | |
| lens structure | 12 16 | 12 16 |
| special lenses | aspherical lenses, one UD (ultra low dispersion) lens | aspherical lenses, one UD (ultra low dispersion) lens |
| recently focusing distance of | about 0.39 m | about 0.45 m |
| maximum magnification | about 0.28 times | approximately 0.21 times |
| hand-shake compensation effect | 4 | 4 |
| filter size | φ67 mm | φ67 mm |
| maximum diameter × length | about φ76.6 × 96 mm | about φ75.4 × 101 mm |
| weight (lens body only) | about 480 grams | about 455 grams |
EF 40mm f/2.8 the STM product specifications
| the STM the | the EF 40mm f/2.8 |
| lens structure | 6 |
| special lenses | aspherical lenses |
| recently focusing distance of | about 0.3 meters |
| maximum magnification | approximately 0.18 times |
| hand-shake compensation effect | no |
| filter size | Φ52 mm |
| maximum diameter × length | about φ68.2 x 22.8 mm |
| weight (lens body only) | about 130 g |
■ EF-S 18-135mm f/3.5-5.6 the IS STM MTF curve
The
■ EF 40mm f/2.8 STM MTF curve
trade name
expected time to market
the EF-S 18-135mm f/3.5-5.6 the IS STM
late June 2012
the EF 40mm f/2.8 the STM
late June 2012
(This article Source:, Netease Digital) 
, NetEase digital channels: camera information
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