Canon Celebrates 50th Anniversary of the Firm’s First Interchangeable Lens for SLR Cameras to Feature an Aspherical Lens Impart

Canon Celebrates 50th Anniversary of the Firm’s First Interchangeable Lens for SLR Cameras to Feature an Aspherical Lens Impart


Canon Inc. announced this day that this three hundred and sixty five days marks the 50th anniversary of the release of the FD55mm F1.2AL, the firm’s first interchangeable lens for SLR cameras that featured an aspherical lens say. This day, aspherical lens substances are no longer excellent aged within the firm’s lenses for ILC cameras, nonetheless furthermore broadcast lenses, semiconductor lithography techniques, telescope mirrors and a fat decision of optical merchandise.

Aspherical lenses possess a curvature that is ultimate for gathering gentle at a single level. From the F2.8 L IS USM zoom lens sequence for knowledgeable and enthusiast users — the RF15-35mm F2.8 L IS USM (launched in September 2019), RF24-70mm F2.8 L IS USM (launched in September 2019) and RF70-200mm F2.8 L IS USM (launched in November 2019) — to the RF28-70mm F2 L USM (launched in December 2018) which aspects a fast f/2 aperture real via all the zoom differ, Canon’s aspherical lenses aid minimize a complete lot of sorts of aberration and provide high image quality.

The inherent characteristics of spherical lenses consequence within the lens being unable to level of curiosity parallel rays of gentle in their total web at a single fashioned level. Attributable to the lens’ spherical-fashioned ground, blurring of photos — identified as spherical aberration — and diverse optical aberrations are inclined to happen within the captured image. Prior to the introduction of aspherical lens, in stammer to merely spherical aberration, a complete lot of spherical lenses wanted to be placed in a boom configuration. Nonetheless, thanks to their uncommon properties, the the same results would per chance also be completed utilizing excellent a single aspherical lens. In 1963, Canon embarked upon a program of sophisticated lens analysis and pattern in stammer to construct this “dream lens” that would per chance level of curiosity all incident gentle on a single level and invent a consistent, determined image.

In stammer to mass-compose aspherical lenses, Canon wished processing technology that used to be staunch to internal lower than 0.1 micrometers1, as smartly as high-precision measuring devices that would per chance measure to internal 0.01 micrometers. Thru repeated cycles of create and processing programs, the firm at closing succeeded in increasing the technology wished to mass-compose aspherical lenses. In March 1971, Canon’s first interchangeable-lens SLR camera employing an aspherical lens used to be launched—the FD55mm F1.2AL. Then, in 1973, Canon extra enhanced the precision of its lens processing technology with the pattern of the ALG-Z nanometer2 stage ultra-high-precision aspherical lens grinder. The next leap ahead came about in 1985, when the firm efficiently implemented the huge-diameter glass mold (GMo) aspherical lens say into the original FD35-105mm F3.5-4.5 (launched in December 1985), the world’s first interchangeable lens for SLR cameras to incorporate a GMo aspherical lens. Since then, the technologies aged to web and measure aspherical lenses delight in played a extraordinarily foremost segment in Canon’s efforts to take hang of high-performance lenses.

Canon’s technological portfolio includes four sure aspherical lens processing technologies: Aspherical lens grinding and sharpening, which employs diamond-tipped tools to grind and polish the lens glass; aspherical glass molding, via which the lens glass is pressed and fashioned utilizing an aspherical mold; aspherical replica technology that uses an aspherical mold to web aspherical resin on the bottom of spherical glass; and aspherical plastic molding, which injects and shapes resin internal an aspherical mold. Basically essentially based totally on the properties of the aspherical lens say and its dwelling within the lens’ optical configuration, Canon will employ the acceptable technology in stammer to compose lenses which are in a dwelling to aid the wide-ranging wants of our clients.

Canon develops its lens processing machinery independently in stammer to create the manufacturing of aspherical lenses with a high level of precision. For instance staunch how real Canon’s technology is, excellent 0.1 micrometers’ discrepancy is allowed between the scale of a lens’ create schematic and the performed product. For a lens expanded to the scale of the roof of the Tokyo Dome (diameter: approx. 244 m), this might mean a margin of error smaller than 0.5 mm, or the thickness of historical mechanical pencil lead.

Moreover, aspherical lens grinding and sharpening technology — the most staunch of the four technologies—is aged no longer excellent within the production of SLR camera lenses, nonetheless furthermore within the sciences. For instance, the major camera optical correction design of the Nationwide Colossal Observatory of Japan’s Subaru Telescope aspects aspherical lenses made by Canon, utilizing the firm’s high-precision size and processing technologies.

The Results of Aspherical Lenses

An interchangeable lens comprising of excellent spherical lens substances, equivalent to big-diameter or wide-angle lenses, ends up within the presence of spherical aberrations and distortions greatly increasing. Spherical aberration occurs when incident gentle parallel to the lens’ optical axis, the dwelling of the fashioned image when gentle rays are nearer to the lens’ optical axis and photos fashioned when gentle rays are extra from the lens’ optical axis are misaligned, ensuing in a blurred image. Moreover, distortions happen when the topic and the image fashioned by the lens fail to web the same photos, inflicting straight traces to become distorted within the following image.

Aspherical lenses are the draw in which to such considerations ended in by spherical lenses and aid compose ultimate photos. Their zigzag surfaces, fashioned in a totally different draw than spherical lenses, aid minimize a differ of aberrations. For instance, in monotonous evening cityscapes where there is more seemingly to be a complete lot of gentle sources, aspherical lenses can reduce the pause of “bleeding” pause of the gentle sources due to spherical aberration.

Into the long shuffle, Canon will continue to optimize its optical technologies in stammer to invent merchandise and technologies that aid meet our clients’ wide-ranging wants.

About Canon U.S.A., Inc.

Canon U.S.A., Inc., is a leading supplier of shopper, business-to-business, and industrial digital imaging options to the USA and to Latin The US and the Caribbean markets. With roughly $30.4 billion in global income, its dad or mum firm, Canon Inc. (NYSE:CAJ), ranks third total in U.S. patents granted in 2020† and is one in every of Fortune Journal’s World’s Most Admired Companies in 2020. Canon U.S.A. is dedicated to its Kyosei philosophy of social and environmental responsibility. To aid apprised of the most up-to-date recordsdata from Canon U.S.A., be a half of for the Firm’s RSS recordsdata feed by visiting and follow us on Twitter @CanonUSA.

#  #  #

†Basically essentially based totally on weekly patent counts issued by United States Patent and Trademark Workplace.

1 One micrometer (µm) is one millionth of a meter.

2 One nanometer (nm) is one billionth of a meter.

( Press Release Image: )


This recordsdata assert material used to be configured by WebWire editorial employees. Linking is allowed.

News Release Distribution and Press Release Distribution Services and products Provided by WebWire.

Study Extra

Leave a Reply

Your email address will not be published. Required fields are marked *