Canon EF 70 - 300 mm DO IS USM
Jan 29, 2004 at 04:01 GMT
Pre-PMA 2004: Canon has today announced the new EF 70 - 300 mm F4.5 - F5.6 DO IS USM zoom lens, the first zoom lens ever to use Diffractive Optical (DO) elements. These new elements, seen previously only in the 400 mm F4.0 DO lens enable this 4.2x telephoto zoom lens to measure less than 10 cm long at the 70 mm position. On a digital SLR with an 1.6x FOV crop such as the EOS 10D this lens has an effective field of view of 112 to 480 mm, on the new EOS-1D Mark II the lens has an effective field of view of 91 to 390 mm. The lens will be priced at $1,299 (US) / €1,299 (EU).
Canon: First ever zoom lens with DO elements
Amstelveen, The Netherlands, 29 January 2004. Canon, a leader in photographic and imaging technology, today releases the EF70-300mm f/4.5-5.6 DO IS USM telephoto zoom lens. A new triple-layered diffractive optical element (DO) has enabled Canon to produce a 70-300mm lens less than 10cm long. The lens also includes Canon's Image Stabilisation technology to dramatically reduce camera shake, compensating for approximately three stops in shutter speed without any perceptible increase in image blur. A virtually silent ultra-sonic motor (USM) gives the lens extremely fast autofocus.
"This lens is symbolic of Canon's leadership in precision optics", said Mr. Komatsuzaki, Head of Canon Consumer Imaging Europe, at the lens' launch. "Canon stands alone as the only company to have successfully commercialised Diffractive Optical elements in camera lenses, and the results speak for themselves."
Full time manual focusing, a circular aperture diaphragm, and a zoom ring lock mechanism to fix the lens at the shortest focal length are all built in. The lens boasts image quality approximating that of Canon's L series professional lenses. It is likely to appeal to professional photojournalists and serious advanced amateurs with a need to contain the size and weight of equipment carried.
This is the first DO lens to be released by Canon since it astonished the photographic community with the award winning EF 400mm f/4 DO IS USM: A lens approximately 26% shorter and 36% lighter than any lens of comparable specifications. Use of the new three-layer DO lens drastically reduces the overall length and weight of the lens system increasing the refractive power of each lens element and reducing the spaces between elements. Chromatic aberration normally associated with increased compactness was corrected by positioning the Three-layer type DO lens on the front lens side. This, coupled with the correction of spherical aberration through the use of aspherical surfaces, delivers high image quality and high levels of resolution and contrast, rivalling the performance of Canons legendary L-series lenses.
The EF70-300mm f/4.5-5.6 DO IS USM features a zoom ring locking mechanism, locking the lens at its shortest total length. This helps to protect the lens from potential damage by preventing the zoom elements extending under their own weight. This might otherwise occur when the lens is mounted to a camera that hangs from a neck or shoulder strap.
The lens incorporates Canon's renowned Image Stabilisation (IS) technology, compensating for approximately three stops without any perceptible increase in image blur when shooting static subjects or panning.
This vastly increases the range of circumstances in which hand-held photography is possible, limiting the need to carry a tripod. During major movement in a single direction, IS Mode 2 technology automatically determines that the movement is conscious panning and halts correction in the relevant direction, thereby preventing shake-return. The IS system automatically detects lack of movement / vibration to prevent operation errors when a tripod is in use. IS efficacy increases and lower overall size have been achieved through improvements in the moving contact sections of the IS lens barrel, the IS lens group barrel locking mechanism and the shake-detection gyro.
A rear focusing ring type USM, high-speed CPU and new AF algorithms combine to give the lens extremely fast auto-focusing. The ring-type ultrasonic motor (USM) converts ultrasonic vibrational energy into rotational force to deliver high-speed, high-precision, super efficient and virtually noiseless auto focusing, with good holding torque for rapid response and accurate stopping. Full-time manual override is featured, removing the possibility of damage to the autofocus mechanism during manual focus. The lens has a minimum focusing distance of just 1.4m throughout the entire zoom range.
Ideal for digital
Lens shape has been optimised and new coatings added to suppress ghosting and flaring. This makes the lens ideal for use with digital cameras that are more susceptible to reflections off the recording media than are film cameras. When fitted to digital cameras with an APS-C size sensor such as the EOS 10D, the lens will have an equivalent focal length range of 112 480mm in the 35mm format.
Appropriate refractive and DO elements are combined to realise low distortion, high corner-to-corner resolution throughout the entire zoom range. As with all EF lenses, aperture is controlled with an EMD (electromagnetic diaphragm) for fast, quiet, highly precise control and the lens incorporates a near circular aperture diaphragm for beautifully pleasing background blur.
Working with EOS
The drive pattern of the lens is tailored to specifically match that of the latest EOS range, extracting maximum benefit from the lens speed advantage. The lens comes with a case LP1116 and an exclusive hood ET-65B for shading against unwanted direct light.
In harmony with the environment
In keeping with Canons stringent environmental policy, only lead free glass is used in the lens optics.
Canon EF 70 - 300 mm DO IS compared to Canon EF 75 - 300 mm IS
|Left, the new EF 70 - 300 mm DO IS lens
Right, the old EF 75 - 300 mm IS
|Both lenses at full telephoto extension|
Canon EF 70 - 300 mm F4.5 - F5.6 DO IS USM specifications
|Lens construction||18 elements in 12 groups, including diffractive optical elements|
|Coating||Super Spectra Coating|
|Diagonal angle of view||34� - 8� 15�|
|Vertical angle of view||19� 30� - 4� 35�|
|Horizontal angle of view||29� - 6� 50�|
|AF Drive system||Ring USM|
|Manual focusing||Enabled with focus mode switch and focusing ring (full-time manual focusing)|
|Focusing range||1.4m to infinity (at all zoom focal lengths)|
|Maximum magnification (x)||0.06 (Wide); 0.19 (Tele)|
|Mount type||Canon EF mount|
|Minimum aperture||f/32-38 (f/32-40 for cameras featuring 1/3-stop increments)|
|Aperture blades||6 (circular type)|
|Diameter x Length (mm)||82.4 x 99.9|
|Extension Tube EF12 II||Compatible|
|Extension Tube EF25 II||Compatible|
|EF 1.4x II or EF 2x II||Not compatible|
|Image Stabilizer (IS)||Included; activated by pressing the shutter button halfway|
|IS modes|| Mode 1: normal image stabilization
Mode 2: unidirectional image stabilization
|IS max. deviation||Approx. 0.9mm|
|IS max. correction angle||Approx. 0.43� (at telephoto, infinity)|