The PRIMA Art common main objective stereomicroscope has through the lens 50W LED lighting and extra long extension arm. Perfect for art conservation work. The fully articulated arm allows viewing of pictures or paintings on table tops or easels. Maximum extension from the center of the vertical column to the center of the common main objective is 55 inches! (4.6 feet.) Apochromatic magchanger 5 step: 0.4X, 0.6X, 1.0X, 1.6X, 2.5X with 250 mm (9.4 inches) working distance. 0-210 degree tilting viewing head. Dual camera port or discussion teaching arm available.