The ATX, STX and BTX objective modules offer you unparalleled modularity and unimagined application possibilities. Four objective sizes are available for intensive nature observations: 65 mm, 85 mm, 95 mm or 115 mm. This 85 mm is an amazing tool, this on the BTX is a great size and weight for then big eyes or on an ATX/STX is great for taking video and pictures.
