Focusdistance

A3: The advent of computer-controlled polishing in the 1980s revolutionized the manufacturing process for aspheric lenses, making it more feasible and efficient. The development of simulation software, like 3DOptix, has also greatly accelerated the design and development process by enabling computational modeling of lenses and immediate performance feedback.

The angle indicating the width of the field included in the photo is called the "angle of view." A wide-angle lens has a wide angle of view and a telephoto lens has a narrow angle of view.

Focal distance vs focallength

A1: Traditional lenses have a spherical surface, whereas aspheric lenses have a non-spherical surface. This unique shape enables aspheric lenses to bend and focus light in more complex ways than their spherical counterparts, leading to sharper and clearer images.

Attaching a 1.88x teleconversion lens to a 72 mm lens gives an angle of view equivalent to a 135 mm medium telephoto lens.

Since then, the aspheric lenses have continuously evolved, with recent decades witnessing a surge in the use of these lenses in an array of applications ranging from astronomical telescopes to smartphone cameras, signaling the era of ubiquitous aspheric lenses.

A crucial aspect of the evolution of aspheric lenses has been the development of computational tools for design and simulation. The advent of software solutions that could simulate the behavior of light passing through these complex surfaces drastically accelerated the design and development process.

Attaching a 0.75x wide conversion lens to a 28 mm lens gives an angle of view equivalent to a 21 mm ultra wide-angle lens.

focal length中文

The concept of aspheric lenses is not a modern-day marvel but has its roots in antiquity. The idea dates back to the times of ancient Egypt and Rome, where polished crystals were used as primitive aspheric lenses to focus sunlight. The Renaissance period saw advancements in lens making, but it wasn’t until the 18th century when French physicist Alexis Clairaut mathematically described aspheric surfaces.

Depth offocus

3DOptix’s ability to model sophisticated optical systems with multiple lenses is a further innovative characteristic. This has proven invaluable in fields such as telecommunications and space science, where precision and efficacy are of the utmost importance.

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Even if the focal lengths of the lenses of two digital cameras are the same, the angle of view can vary depending on the size of the image sensor used in each. To make it easier to understand angle of view, focal length is often expressed as "__ mm equivalent," which means it has been converted to the 35 mm film camera format that has been historically the most common. Here on this site also, we state focal lengths that are converted into 35 mm film camera format.

* The GXR interchangeable unit camera system has camera units with a fixed focal length lens and camera units with a zoom lens.

A5: 3DOptix has brought a paradigm shift in the industry by accelerating design cycles, reducing costs, and enhancing collaboration. It has made precision optical design accessible not only to large organizations but also to small businesses and academics, thereby democratizing the field of optical design.

With a zoom lens, when you turn on macro mode and move as close as possible while still keeping the subject in focus, the minimum distance to the subject and the size of the subject in the frame will differ depending on whether the lens is at a wide-angle or telephoto zoom position. With a wide-angle setting you may be too close and with a telephoto setting you may be too far away so adjust the focal length to find the one that makes it easiest to take the shots you want.

FOV to focallength

At the forefront of this wave of innovation is 3DOptix. This game-changing simulation software has enabled designers to visualize and model aspheric lenses and their behavior in a virtual environment. It’s an advanced tool that allows for the computational modeling of a lens, providing immediate feedback on its performance before it’s physically manufactured.

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Significantly reducing the time and cost associated with lens design and testing, 3DOptix has introduced a paradigm shift in the industry. Its ability to accurately simulate the behavior of light, taking into account multiple factors such as chromatic aberrations and distortions, is revolutionary.

This is a lens used for close-up photography. A macro lens can shoot from a distance closer to the subject than a regular lens. The GXR interchangeable unit camera system has a camera unit with a 50 mm macro lens. Link to more information on GXR camera unit

However, despite Clairaut’s pioneering work, it was only in the 1950s that practical aspheric lenses came into being. A significant challenge in producing these lenses was their manufacturing process, which required a high degree of precision that was both time-consuming and expensive.

focal length是什么

A2: The production of aspheric lenses requires a high degree of precision that was both time-consuming and expensive. This challenge was especially significant before the advent of computer-controlled polishing in the 1980s.

A conversion lens is attached to a lens to enable it to take photos with a wider angle or stronger telephoto magnification.

3DOptix has also improved field collaboration by providing a shared platform where designers and engineers from all over the world can interact, exchange, and learn. This has led to the democratization of optical design, as the software is now accessible to both large corporations and small businesses, and academics.

Then came the 1980s and the revolution of computer-controlled polishing, which made the production of aspheric lenses more feasible and efficient. This period also saw the rise of molded glass and plastic aspheres, leading to the mass production of compact discs and DVDs, marking a significant milestone in the history of aspheric lenses.

A4: 3DOptix allows designers to model aspheric lenses and their behavior in a virtual environment, significantly reducing the time and cost associated with lens design and testing. It can simulate the behavior of light with high precision and model complex optical systems involving multiple lenses. Furthermore, it enhances collaboration by offering a shared platform for designers and engineers to interact, share, and learn.

The distance from the center of the lens to the image focal point (=image sensor surface) is known as the focal length. It is expressed in millimeter (mm) units. A lens with a short focal length is a wide-angle lens and one with a long focal length is a telephoto lens.