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This results in a high-performance optical system that delivers pin-sharp stars across the entire field of view. The LX200-ACF design overcomes both problems inexpensively by using a hyperbolic secondary mirror. Traditionally, scopes that try to correct for both optical aberrations, called aplanatic telescopes, are expensive to produce. Unfortunately, such mirrors have a flaw because they have spherical aberration, a condition where light from the outer part of the mirror reaches focus closer to the mirror than light from the centre.Ī corrector plate is usually fitted to the front of the telescope to reduce the spherical aberration, but the design would still suffer from coma, which causes stars at the edge of the view to look a bit blurred. The LX200-ACF telescope stands out from its predecessors because of its advanced coma-free (ACF) optics. The original LX200 range was based on the Schmidt-Cassegrain telescope, which uses an easy-to-produce spherical primary mirror as its optical heart.