Achromatic refractors use two lens elements to reduce chromatic aberration, offering clear views suitable for beginners and casual observers.
Apochromatic (APO) refractors use three or more specialized lens elements to virtually eliminate color fringing, delivering crisp, high-contrast images favored by astrophotographers.
While APOs tend to be more expensive and heavier, their superior optical performance is worth it if you want the best planetary and lunar detail without distracting color halos.
