The Optical System Assembly (OSA) in the FORMOSAT-8A optical remote sensing instrument is equipped with a high-resolution Ritchey–Chrétien optical system with 396mm aperture and 3927mm effective focal length. This system can capture high-resolution images with ground sampling distance of 1.0 meter, using a 7μm pixel-size image sensor while orbiting at an altitude of 561km (0.7m GSD with post image processing).

The FS8A/B RSI OSA is a high-resolution spaceborne optical system. It is designed to overcome the vibrations and shocks experienced during the launch phase and provide high-resolution and high-quality images on orbit.

Based on the technologies developed from the FS8A/B RSI OSA, it can be made available for the development of small-space optical systems in the optical industry.