Flattener for 140APO ASKAR

The 1.0x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 140APO, it still maintained a focal ratio of 7. The flattener corrects field curvature and coma, resulting in flatter field edges and finer star points.

The 1.0x flattener adopts a triplet design and supports a 44mm full-frame image circle. The overall weight is 0.75kg. The back focus from the M48 thread is a standard 55mm. The front thread is M92*1. At the camera end, it is equipped with M68*1, M54*0.75 and M48*0.75 three sizes of adapters, which are convenient for connection. At the same time, it has a built-in M48*0.75 2-inch filter thread, which can be directly installed and used. The overall CNC machined, both end threaded metal caps prevent ash when not in use.

Features:

• 1x Flattener Parameter（After attaching）140APO Focal length: 980mm
• (After attaching）140APO Focal ratio: f/7
• Lens Number: Triplet design
• Back Focus: 55mm（from the base of M48 male thread）
• Weight: 0.79kg
• Rear-end thread type:
  M68×1
  M54×0.75
  M54×0.75-M48×0.75 (M48×0.75 filter thread inside)