Optical Test System with Distance Extension for Macro Lens Testing

The patent introduces a distance extension module as an intermediary device between the light source and the macro lens assembly. This module extends the optical path and creates a virtual point light source at a manageable distance, allowing accurate testing without directly positioning physical light sources at close ranges. The intermediary module transforms the difficult close-distance positioning problem into an easier far-distance positioning problem.

The patent creates a virtual copy of the point light source through optical transformation. By using the distance extension module to form a virtual image of the light source at an extended distance, the system replicates the desired point light source characteristics without requiring the physical light source to be positioned at the difficult close distance. This virtual copying approach maintains testing accuracy while eliminating positioning difficulty.

The patent introduces a dynamic distance extension module that can adjust the virtual object distance to match different macro photography scenarios. This dynamic adjustment capability allows the testing system to adapt to various macro lens configurations and object distances, making the testing process less complex while maintaining the ability to evaluate true macro performance characteristics.

The patent changes the optical parameters of the testing system by introducing a distance extension module with specific focal lengths and refractive indices. This parameter change transforms the testing setup from a complex close-distance arrangement to a simplified far-distance arrangement, reducing testing complexity while preserving the evaluation of macro lens performance through virtual object formation.