EF 70–300mm f/4–5.6 IS USM

EF 70–300MM F/4–5.6 IS USM

EF 70–300mm f/4–5.6 IS USM

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Overview

The EF 70-300mm f/4-5.6 IS USM telephoto zoom lens has been developed to meet the high-performance standards that today’s photographers demand. Improved Image Stabilizer Technology provides up to three stops of “shake” correction, and the “Mode 2” option stabilizes images while panning with a moving subject. Compared to the original Canon EF 75-300mm IS zoom lens, this telephoto lens has faster autofocus, and overall the lens is lighter and has a smaller diameter than the original. The zoom ring can be locked at the 70mm position, making this powerful lens easy to transport, too.

Affordable high magnification

The powerful, yet reasonably priced, EF 70-300mm f/4-5.6 IS USM will appeal to nature and sports photographers looking to achieve sharper images when shooting handheld. When fitted to an EOS camera containing an APS-C sized sensor, the lens gives an angle of view roughly equivalent to a 112-480mm lens on a full-frame DSLR.

Image Stabilizer

The EF 70-300mm f/4-5.6 IS USM features a three-stop Image Stabilizer (IS), making this an ideal lens for handheld work. Shutter speeds up to three stops slower than would be otherwise possible can be used with no perceptible increase in image blur. When panning horizontally, the IS system can be set to correct only for unwanted vertical shake, and the system switches off when the camera is mounted on a tripod.

UD lens element

A UD (ultra-low dispersion) glass lens element corrects for chromatic aberrations and provides high resolution and contrast throughout the zoom range. Only environmentally friendly lead-free glass is used in the lens construction.

Super Spectra coating

Super Spectra coatings ensure accurate colour balance and enhance contrast. They also reduce flare and ghosting – a common problem caused by light bouncing off a camera’s sensor.

Pleasing background blur

A virtually circular aperture diaphragm, which is controlled electromagnetically, gives out-of-focus regions a softer, more even feel, and lets in-focus subjects stand out against a blurred background

Ultrasonic focusing

A ultrasonic motor drives auto-focus extremely quickly, and in near silence. Excellent holding torque ensures the point of focus is reached accurately, without overshooting.

 

Features

 

Super UD Lens Elements, UD Lens Elements

Effect similar to fluorite lens elements

The chromatic aberration correction effect is remarkable when a fluorite element is used. However, due to the high cost of fluorite compared to other materials, it cannot be employed widely on many lenses. To resolve this issue, Canon developed the UD (Ultra Low Dispersion) lens element, which is characterised by a low refractive index and low dispersive properties. It is widely employed in many lenses due to its ability to enhance the elimination of secondary spectrum.

ud-lens-elements1

 

IS (Image Stabilizer)

In-lens correction of camera shake

Canon was the first in the world to develop the IS (Image Stabilizer), an in-lens system to correct camera shake in DSLR cameras. Compared to the in-camera Image Stabilizer feature, not only is the IS capable of stabilising the viewfinder image, it also helps to improve AF accuracy.
The underlying principle is that the amount of misalignment between the image of the subject and the optical axis of the lens is detected by two vibration-detecting gyro sensors. The corrective optical system inside the lens is then moved accordingly in the vertical or horizontal direction to stabilise the image of the subject on the imaging plane.
Most blurry pictures occur as the result of camera shake, which inevitably happens when you take handheld shots. Such blurring is more obvious at slow shutter speeds, which usually occur at low light settings such as during indoor portrait or night street photography because the low amount of light requires the sensor to be exposed for longer. For that reason, photographers usually make up for that by setting a higher ISO speed or using a tripod and remote shutter release. Both have their merits, but also some demerits.

For instance, while increasing the ISO speed also increases the shutter speed, noise occurs at high ISO speeds. There is therefore a limit to how high you can set the latter without compromising on image quality. Similarly, while using a tripod and remote shutter release keeps camera shake to a minimum, they are practical only for certain shooting scenes as prior setup is required.

IS, on the other hand, is able to suppress camera shake to a certain degree even for such scenes, increasing the range of scenes for which you can take handheld shots. Depending on the lens, the image stabilization effect may allow you to shoot at 2-5 shutter speed stops slower than without IS.

image-stabilizer1

With IS function

image-stabilizer2

Without IS function

 

Ring USM, Micro USM, Nano USM

Enables silent and high-speed focusing

USM (Ultrasonic Motor) was first put into practical application in the world by Canon. USM drives the lens by transforming ultrasonic vibrations into rotation energy. Not only does it consume little power, it has high efficiency, torque and response, enabling high-speed focusing with almost no operating sound emitted.

There are three types of USM . The round-shaped Ring USM is simple in structure, and is best suited for use in a circular lens tube. It is especially useful for driving lenses such as large-diameter or super telephoto ones due to its high torque, and it also allows for full-time manual focusing. Meanwhile, the Micro USM can be employed on many types of lenses because it is low in cost and not subject to restrictions on the lens diameter. In 2002, Canon contributed further to the downsizing of lenses with the development of the Micro USM II, which is about half the size and weight of the Micro USM . And in 2016, Canon introduced Nano USM, which not only realizes a high speed AF that rivals that achieved by Ring USM, but also is able to operate quietly and seamlessly. It’s not an exaggeration to describe Nano USM as the most ideal motor for normal-use lenses that are meant to handle both still photography and movie shooting.

 Rung USM

ring-micro-usm2

Micor USM (Left), Micro USM II (Right)

ring-micro-usm1

Nano USM—The thin and tiny USM motor that achieves fast and smooth AF

Thin and compact, this USM, the latest to be developed by Canon, made its debut in 2016 on the EF-S18-135mm f/3.5-5.6mm IS USM. Computer chip-shaped (a factor that allows a more compact lens design) with power sources in the form of transducers, it connects directly to the AF actuating mechanism. It possesses a speediness and responsiveness that rivals that of the Ring USM, combined with a control that equals that of STM (lead screw-type). Its main benefit lies in enabling quiet, smooth AF operation in compactly-sized lenses such as standard zoom lenses. Also very suitable for movie-shooting, its high speed AF is able to handle scenes with subjects that are moving at a fast speed as well as those with unpredictable movements.

ring-micro-usm3

The Nano USM is shaped like a computer chip, and has 2 transducers in its center.

Ef 16-35mm f2.8L III USM Cross Section Ef 16-35mm f2.8L III USM Cross Section 2

A cross section of the EF-S18-135mm f/3.5-5.6 IS USM, released in 2016 and the first lens to carry the Nano USM. Moving along the top of the slider, the Nano USM directly drives the main AF power source. As this motor not only allows for fast and smooth AF but is also small in size, it makes it possible for the lens that utilize it to be around the same size as lenses with STM.

 

Inner Focusing, Rear Focusing

Enables high-speed and precise AF

The inner focusing and rear focusing systems adjust the focus by moving only some of the lens elements inside the lens. Inner focusing refers to the type where the focusing lens group is located in front of the aperture diaphragm, while this group is positioned behind the aperture diaphragm in the case of the rear focusing type. As a smaller number of lens elements need to be moved, AF speed can be increased, and the size and weight of the entire lens can also be reduced. Besides, the front of the lens does not extend out during focusing, thus making it easy to achieve an integral lens structure, which in turn contributes to the enhanced robustness of the design. Yet another advantage of this system is that it enhances the operability of polarising filters as the filter mount does not rotate during focusing.

 inner-rear-focusing1

EF24-70mm f/2.8L USM Rear System

 inner-rear-focusing2

EF400mm f/5.6L USM Rear System

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EF70-200mm f/2.8L IS II USM Inner System

Full-time Manual Focusing

Enables MF immediately after AF

Many of Canon’s EF lenses are equipped with “full-time manual focusing”, which allows manual focus right after auto focus is complete, just by turning the focusing ring and without the need to switch to MF mode. All Ring USM and STM lenses support full-time manual focusing.

full-time-manual-focusing1

 

 

Circular Aperture Diaphragm

Expresses point light sources in beautiful round bokeh

The aperture is made up of several blades, the number of which determines the shape of the bokeh effect, such as in the case of illumination, light seeping through the leaves of a tree, and light reflection from the water surface. Light normally appears round when seen through our eyes, thus expressing light in a circular shape adds a more natural and soft touch to the resulting image. Almost all EF lenses employ a circular aperture diaphragm.

 

 

Specifications

PHYSICAL SPECIFICATIONS

Specification Details
PRODUCT WEIGHT INPUT-1 650 g
FILTER DIAMETER (MM) 58
MAXIMUM DIAMETER X LENGTH (MM) 76.5mm x 142.8mm
WATER/DUST RESISTANCE No

OPTICAL CHARACTERISTICS

Specification Details
AF ACTUATOR Ring USM
DISTANCE INFORMATION Yes
LENS CONSTRUCTION (ELEMENTS/GROUPS) 15/10
MINIMUM APERTURE 32-45
AF ACTUATOR Full time Manual focus
MAGNIFICATION WITH EXTENSION TUBE EF12 II 0.29-0.04
MAGNIFICATION WITH EXTENSION TUBE EF25 II 0.38-0.09
ANGLE OF VIEW 34° – 8° 15′(diagonal)
CLOSEST FOCUSING DISTANCE 4.9 ft/1.5 m

ACCESSORIES

Specification Details
EXTENDER COMPATIBLITY  Not Compatible

 

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EF 70–300mm f/4–5.6 IS USM

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