William Optics Field Flattener

Refractor telescopes naturally produce a curved image plane, which can make stars at the edges of your view look distorted or stretched. This accessory flattens that plane, ensuring your stars remain sharp and pinpoint-accurate from the center all the way to the corners of your frame.

While this is designed for use with refractor telescopes, compatibility depends on your specific telescope's focal length and design. It is best to verify that your specific William Optics model or refractor type is supported to ensure proper back-focus spacing.

No, this is a field flattener, not a Barlow lens or focal reducer. Its primary purpose is to correct optical aberrations at the edge of the field of view without altering the magnification or focal length of your telescope.

If you are capturing images, this is essential for achieving edge-to-edge sharpness on your sensor. Without it, you will likely notice 'star trailing' or distortion in the corners of your photos, even if the center of the image is perfectly focused.

Installation is straightforward. It functions as an adapter that threads directly into your telescope's focuser or imaging train. Just ensure you have the correct adapters or spacers if your camera setup requires specific back-focus distances.