Quality identification of camera lenses lens
Lens quality identification requires comprehensive evaluation of optical performance, imaging effects, and technical parameters, including the following key indicators:
Optical performance evaluation
Resolution and sharpness
High quality lenses need to maintain high resolution throughout the entire aperture range, with edge clarity consistent with the central area. High contrast scenes such as fabric textures and architectural details can be captured to observe the magnified details.
Distortion control
Wide angle lenses need to control barrel distortion, while telephoto lenses need to reduce pillow distortion. Shoot regular line scenes (such as building grid diagrams) to check the degree of straight line curvature.
Dispersion control
High contrast scenes (such as blue skies and building edges) are prone to purple or green borders, and high-quality lenses can effectively suppress this phenomenon.
Dark corners and vignetting
The dark angle under the maximum aperture should be minimized as much as possible, and it needs to be significantly improved after reducing the aperture. Shoot uniformly illuminated scenes (such as white walls or sky) and observe changes in brightness at all corners.
Imaging effect evaluation
External manifestation (blurring effect)
The large aperture lens should present a smooth creamy blur to avoid onion rings or non-linear effects. Observe the naturalness of transitions in scenes where the foreground and background are separated.
Color reproduction
Standard color cards are used to test the accuracy of color reproduction, or to compare actual colors when shooting flowers or scenic scenes. Color consistency needs to be checked under different white balance settings.
Technical parameter reference
Maximum aperture and focal length
Large aperture lenses (such as f/1.4) perform better in low light environments, but require a balance between aperture and imaging quality.
Lens structure and material
Metal or high-grade plastic materials are more durable, and the dust-proof and moisture-proof design enhances outdoor applicability.
Laboratory testing methods
Use a resolution board to test the resolution of the lens, observe the image clarity through optical instruments, or analyze the line resolution of the captured film.
