S7999 integrated high-precision M42, M48, M54 suitable for Canon ring, with M48 filter interface

S7999-1 M42*0.75， Equipped with M48 filter interface
One piece high-precision Canon ring with 108 threads, combined with Canon camera flange distance, can achieve the best flange distance of 55. If there is 56, it can be matched with our method
Just use a blue gasket.