ZWO 131mm Quad APO Refractor Maksutov It also allows manual control

It also allows manual control via a compatible hand controller*

5Å natively providing rich surface detail and with its 100mm aperture high resolution viewing and imaging is easily obtainable

Celestron engineers drew on their decades of expertise while designing every detail

DSO imaging cannot live without long exposure

which includes the B1800 blocking filter

ZWO 131mm Quad APO Refractor Maksutov It also allows manual controlZWO 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