What are the optical properties of camera lenses lens?

The optical performance of camera lenses lens is mainly reflected in imaging quality, optical correction capability, and technical characteristics. The core elements include focal length, aperture, coating technology, and lens combination.
Focal length and imaging range
The focal length of the lens directly affects the imaging size and viewing angle range. For example, a 70-300mm lens can cover wide-angle to ultra telephoto shots, making it suitable for travel photography; Short focal length lenses (such as 24mm) can present a wider scene, while telephoto lenses (such as 300mm) are suitable for close-up shooting. ‌
Optical correction technology
Modern lenses commonly adopt a multi lens combination design:
Non spherical lenses: reduce edge distortion and improve image quality;
Fluorite lenses: Canon and other brands use special optical materials to effectively correct color differences;
BR lenses: suppress chromatic aberration and improve edge imaging clarity. ‌
Coating process
The coating technology on the surface of the lens directly affects the transmittance and reflection control:
SWC subwavelength structure coating: using a nanoscale wedge-shaped structure to reduce light scattering;
ASC coating: By overlaying silicon dioxide with an air layer, reflection interference is reduced. ‌
Fast Hybrid AF
Ultrasonic motors (such as circular USM) and stepper motors (such as STM) achieve fast and precise focusing, ensuring clear capture of motion scenes. ‌