ASH Atmospheric Dispersion Corrector - Fused silica multicoated version
ASH Atmospheric Dispersion Corrector - BK7 multicoated version
Astro-Physics 1100GTO CP4 German...
APM Telescopes, founded in 1990, is a german manufacturer and distributor of astronomical and sport optics equipment. APM catalogue is very big and with a large variety of products. Markus Ludes, the founder, is well known among amater astronomers also because his distributions of the apochromatic refractors designed by the late lamenteed Thomas Beck.