كرة نقل F/2.2 - 6 بوصة موجة 1/20، PVr.

The interferometric fringes were crisp and stable right out of the case, and the 1/20 wave PVr spec held up exactly as promised across the full 6-inch aperture. Setup took under ten minutes, and the mounting threads felt precision-machined. For anyone needing a reliable reference sphere in a product

The 6-inch aperture is exactly as specified, and the 1/20 wave PVr surface showed clean fringes right out of the case. Took it straight to the interferometer bench and the residual error matched the cert within tolerance, which is about all you can ask for.

The 1/20 wave PVr spec held up in our lab tests, and the 6-inch aperture gave us consistent fringes across the full clear diameter. Only gripe is the protective case could be sturdier for shipping, but the optic itself is spotless.