Askar 1x Full-frame Flattener for the 140 APO - 140APO-FLAT
Pickup available at Khan Scope Centre
Usually ready in 24 hours
This 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 built-in M48x0.75 (2") thread to accept filters and comes with three adapters (M68*1, M54*0.75, and M48*0.75). Both ends come with threaded metal caps to protect the optics when not in use.
SPECIFICATIONS
Lens Design: Triplet
Back Focus: 55 mm from base of M48 male threads
Telescope Focal Length with Flattener Attached: 980 mm
Telescope Focal Ratio with Flattener Attached: f/7
Camera Side Thread Types: M68*1, M54*0.75, M48*0.75
