Built in UHC/CLS/HA filters - High precision M48 DSLR camera mount, built-in light damage filter astronomical

Improvement advantages: The filter is built into the inner circle of the Canon interface, which can achieve the closest distance with the camera CCD. When imaging, it can effectively reduce and avoid the existence of dark corners.
Built in Yulong UHC/CLS/HA and other filters - high-precision Canon mount, built-in light damage filter for astronomical telescopes