Askar 1x Full-frame Flattener for the 140 APO - 140APO-FLAT 68º Eyepieces Parfocal eyepiece require little to

Parfocal eyepiece require little to no focusing when changing from low to high power

or other movements can alter the image if the readout speed is not quick enough

93 arcseconds Light Gathering Power (Compared to human eye): 73x Optical Coatings: Coated glass optics Optical Tube Length: 381 mm (15") Optical Tube Weight: 3

System Requirement:  Windows 7-10

Optical Tube Weight: 45 lbs (20 kg)

Askar 1x Full-frame Flattener for the 140 APO - 140APO-FLAT 68º Eyepieces Parfocal eyepiece require little toThis Askar 1X Full Frame Flattener is designed specifically for the 140APO. It does not change the effective focal length of the telescope, which is f 7, but it DOES further flatten the field, correcting for both field curvature and coma, to reveal fine star points to the edges of the field. The Askar 1X Flattener has a triplet design and supports a 44 mm image circle. The telescope side has an M91*1 thread, and the camera side of the flattener has a