ZWO 131mm Quad APO Refractor Dew Control This is a quality 4-element

This is a quality 4-element Plossl optical design at a super affordable price

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

at a velocity of 3000 miles per hour

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

ZWO 131mm Quad APO Refractor Dew Control This is a quality 4-elementZWO 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