What does the main lens mean?

Refers to the camera lens with high quality, professional level and artistic quality.

Master lens can produce excellent image quality, clarity and details, with accurate color, high contrast, anti-backlight, anti-scattering and other characteristics. Used in advertising photography, film shooting, documentary production and other professional photography fields, pursuing the highest imaging quality and artistic expression.

When photographers use high-level photographic skills and creativity to create excellent photographic works with high-quality lenses, people will also use "master lenses" to describe them.