ZWO 131mm Quad APO Refractor Dew Control the Autoguider boosts tracking precision

the Autoguider boosts tracking precision for longer manual exposures—reducing rejected frames and maximizing image quality

The 70mm objective lenses offer plenty of light-gathering ability for superior low-light performance

Fully coated optics for excellent light transmission on faint stars

A red flashlight is one of the most beneficial accessories you can own as an amateur astronomer

With a large 8" Newtonian reflector optical tube

ZWO 131mm Quad APO Refractor Dew Control the Autoguider boosts tracking precisionZWO FF131 APO Flat Field Apochromatic Refractor *Focus can be achieved within a back focus range of 4273 mm, measured from the M54M48 interface shoulder. Main Features Flexible Connectivity for Multiple Configurations Uniqueness Four Element Optical Design The FF131 APO features a four element, fully air spaced apochromatic optical design. All four elements work together to deliver a flat imaging field without the need for an additional field