The Infinite Focus: How the Quest to Eliminate Blurry Photos Changed Photography Forever

Every November 30, the Japanese photographic community pauses to observe "Camera Day." It is a commemorative date rooted in a singular industrial milestone: November 30, 1977, the day Konishiroku Photo Industry—better known as Konica—released the Konica C35 AF.

While it may seem like a relic relegated to the "used bin" of history, the C35 AF was a seismic shift in technology. It was the world’s first mass-produced camera capable of focusing itself. Behind the shutter release lay a revolution that redefined the relationship between the human eye and the photographic medium. As we approach the 50th anniversary of this innovation in 2027, the story of the C35 AF reveals how a struggle to solve a simple consumer frustration—the "soft" photograph—eventually birthed the era of artificial intelligence in imaging.

The Genesis of "Jaspin": Solving the 36% Problem

The impetus for the autofocus revolution was not a grand vision of technological supremacy, but a brutal, data-driven market insight. Konica conducted extensive surveys to determine why the average consumer’s snapshots were consistently disappointing. The findings, documented in the company’s corporate history, were damning: 36% of all "ruined" photographs were rejected solely because they were out of focus.

This was not a failure of exposure, composition, or flash usage; it was a fundamental misunderstanding of depth and distance by the operator. For the millions of casual photographers who found the intricacies of rangefinder patches or distance estimation too daunting, the act of photography was a gamble. Konica’s solution was to remove the decision-making process entirely.

The resulting machine, the C35 AF, was deceptively modest. It featured a 38mm f/2.8 Hexanon lens, a programmed leaf shutter, and a rudimentary autofocus module. In Japan, the camera earned the nickname "Jaspin Konica." The term "Jaspin" was a linguistic collision of "just" and the Japanese pinto (focus), which itself derived from the Dutch brandpunt (focal point). It became a shorthand for perfection: a focus that landed exactly where the user intended. The camera was a runaway success, selling over a million units in just two years and cementing November 30 as a permanent fixture on the Japanese calendar.

A Chronology of Innovation: From Honeywell to the Digital Sensor

The history of autofocus is often portrayed as a linear progression of camera brands, but the true engine behind the movement came from an unlikely source: a Minneapolis-based conglomerate known for thermostats, industrial controls, and defense electronics.

1. The Visitronic Era (1975–1980)

Honeywell developed the "Visitronic" module in the mid-1970s. It was a passive system that utilized two small windows on the camera’s top plate to triangulate distance. By comparing the patterns from two slightly offset viewpoints, the module calculated the distance and physically moved the lens via a spring-driven mechanism.

This was the birth of "roof-mounted" focusing. It was ingenious but flawed; because the sensors sat inches away from the taking lens, they viewed the world from a different perspective. If a photographer shot through a window or framed a subject off-center, the camera would faithfully focus on the background instead of the subject.

2. The Sonar and Infrared Detours (1978–1981)

Polaroid took a different, more radical approach with the 1978 SX-70 Sonar OneStep. By utilizing ultrasonic pulses—essentially mimicking a submarine’s sonar—the camera could measure distance in total darkness. While it solved the light-sensitivity issues of passive systems, it struggled with glass barriers and echoes. Simultaneously, Canon experimented with active infrared beams, which eventually became the industry standard for consumer compacts throughout the 1980s.

3. The SLR Struggle: Through-The-Lens (TTL) Attempts

The "Holy Grail" was always to move the focusing mechanism behind the lens. Pentax’s 1981 ME F was the first to attempt this, but it required a dedicated, bulky lens containing its own motor and batteries. Nikon followed in 1983 with the F3AF, which utilized a detachable viewfinder to house the autofocus sensors. These were technical marvels, but they were cumbersome and failed to gain mass-market traction.

4. The Minolta Revolution (1985)

The industry landscape changed irrevocably with the February 1985 launch of the Minolta Maxxum 7000. It was the first camera to integrate both the autofocus sensor and the motor inside the body, powering a new range of lenses. Minolta’s bold decision to abandon their legacy manual-focus lens mount for the new "A-mount" was a gamble that paid off, forcing every other major manufacturer to scramble and rewrite their own roadmaps.

The Legal Aftermath: Honeywell’s Multi-Million Dollar Toll

The success of autofocus did not go unnoticed by the patent holders. In 1987, Honeywell sued Minolta for patent infringement regarding the Visitronic technology. The ensuing legal battle culminated in a 1992 jury verdict in Newark, New Jersey, which awarded Honeywell $96.35 million.

The eventual settlement, totaling $127.5 million, was merely the tip of the iceberg. Honeywell proceeded to reach settlements with seven other major camera manufacturers, including Konica itself. By the mid-1990s, industry analysts estimated that the total payout from the camera industry to the industrial control firm reached between $300 million and $500 million. It remains one of the most significant examples of a "non-practicing entity" extracting a massive fortune from an industry that perfected a technology it had initially licensed.

Implications: The Death of "Focus and Recompose"

The evolution of autofocus has not only changed hardware but has fundamentally altered the craft of photography. For decades, the "focus and recompose" technique—locking focus on a subject’s eye using a center-weighted sensor and then swinging the camera to frame the shot—was a necessary ritual for any professional photographer.

The transition to on-sensor phase detection, pioneered by Fujifilm’s FinePix F300EXR in 2010 and perfected by Canon’s Dual Pixel CMOS AF in 2013, effectively ended this era. By turning every pixel on the imaging sensor into a focusing point, the camera eliminated the need for a separate autofocus module.

Today, we operate in the era of Subject Recognition. Modern flagships like the Sony a1 II, the Canon EOS R5 Mark II, and the Nikon Z9 utilize complex neural networks to identify and track eyes, birds, vehicles, and even insects in real-time. The camera no longer merely calculates distance; it understands the subject.

Conclusion: Closing the Gap

The trajectory of autofocus over the last 50 years can be summarized by a single, relentless pursuit: closing the distance between the point of measurement and the point of recording.

In 1977, the measurement happened on the roof of the camera, several inches from the film. By 1985, it moved behind the lens, but still relied on a separate sensor. By 2013, the sensor was the lens. Today, that distance is effectively zero.

As we look toward the 50th anniversary of the Konica C35 AF, it is clear that the "Jaspin" dream—the simple desire for a perfectly focused image—has been realized beyond what the engineers of 1977 could have imagined. What was once a mechanical challenge of measuring physical space has become a sophisticated digital dialogue between software and light, forever changing the way we document our world. The camera is no longer a machine that needs to be "told" how to focus; it has become an active participant in the creative process, ensuring that the only thing left for the photographer to decide is the moment itself.