The Skywatcher Evostar 150DX ED 0.77x is a premium optical accessory specially designed to enhance the imaging performance of the Sky-Watcher EvoStar 150DX telescope. It reduces the telescope's inherent focal ratio from f/8 to f/6.2, lowering the focal length from approximately 1200mm to about 924mm. This results in a 23% faster optical system, allowing for significantly shorter exposure times by approximately 66% compared to the f/8 setting.

• Optical Design: Fully multi-coated optics for maximum light transmission and minimal internal reflections.
• Transparent Opening: Large 2.7-inch (68mm) clear aperture that minimizes scatter and maintains image brightness.
• Field of View and Image Circle: Fully illuminated 34mm image circle, offering a field of view of 2.22 x 1.48 degrees with full-frame cameras.
• Back Focus Distance: Requires 55mm of optical distance, adjustable with the included adapters.
• Mechanical Design: CNC-machined aluminum body with black anodizing for increased durability and precise optical alignment.
• Thread: Compatible with standard M48 x 0.75 thread for typical astrophotography accessories.

This reducer/idealizer is exclusively designed for the focusing system of the EvoStar 150DX telescope, ensuring perfect optical matching with premium optics that minimize chromatic aberrations and maximize image sharpness and color fidelity.