Star Diagonals and prisms are manufactured by APM-Telescopes in the highest quality. As a rule, the mirror surfaces are made on L / 10. The optical surfaces are all ultra-broadband. The robust housing is precision CNC-milled. The accessories are securely held with the modern 2-inch APM quick-release clamp. The eyepiece 2 "accessories are held tightly over the entire surface by means of ring clamping.