Threads on the back of your LX200 or other Schmidt-Cassegrain telescope to reduce your focal length and broaden your field of view. Threaded on to the telescope's rear cell in front of the 62 T-Adapter or Off-Axis Guider, above, and the camera body, the f/6.3 Focal Reducer/Field Flattener reduces the main telescope's focal ratio by a factor of 0.63 (e.g., from f/10 to f/6.3). It also eliminates the field curvature in the SCT design to provide a flatter field with more in focus stars over a larger area.