屋脊棱镜 roof prism ; DCF

带屋脊棱镜 with roof prism

屋脊棱镜式 roof prism type

屋脊棱镜型 roof prism type

脊角棱镜 roof-angle prism

阿贝屋脊棱镜 Abbe roof prism

屋脊型棱镜 roof prism

屋脊棱镜双像误差 error of double image of roof prism