Most of the focal plane adjusters not the market today use a three-point push-pull mechanism to make adjustments. However, when adjusting the tilt angle in this manner, the relative distance between the two ends changes, thus changing the back focus and lowering star quality at the edges of the image.
The Askar focal plane adjuster uses a unique spherical adjustment design to adjust the tilt angle, ensuring the focal plane is perpendicular to the optical axis of the system without affecting the relative distance for more accurate and consistent adjustments. The angle adjustment range is +/-1º and the adapter is marked with 5' increments to make adjustments easy.
The Askar focal plane adjuster is simple to use, with no need for additional tools, and it also eliminates the need for repeated disassembly and adjustment when attaching a camera or other required accessory. Just rotate the handle to adjust the tilt angle for added convenience. The front thread of the Focal Plane Adjuster is M54 Female, and the rear thread is M48 Male. You will receive an M54 to M48 adapter to convert the front M54 thread to an M48 thread without affecting the overall thickness.
The overall thickness of the Askar focal plane adjuster is 18mm. This means that users of specific Sharpstar telescopes (e.g. APO series, ASKAR V, 71F, 50EDPH) can directly replace the filter thread ring with the Askar Focal Plane Adjuster without recalculating the back focus.
