Lacerta ED 2" eyepieces deliver well-corrected views even in fast telescopes. The manufacturer has applied multiple anti-reflection coatings (fully multicoated) to every air-to-glass surface, minimizing internal reflections while maximizing light transmission.
Lacerta ED 2" eyepieces are available with 30 mm and 40 mm focal lengths, making them ideal for low- to medium-magnification observation of large nebulae, comets, or sweeping the Milky Way. When choosing an eyepiece, it is also worth considering the exit pupil diameter. For example, with a 120/600 refractor, the 8 mm exit pupil produced by a 40 mm focal length cannot be fully utilized. The 30 mm focal length is therefore a more sensible choice, as the 6 mm exit pupil is still within the maximum pupil diameter of most observers' eyes up to the age of 40–50—and for the lucky ones, even beyond.
Both eyepieces offer an impressive 69° apparent field of view. Their optics consist of six elements, one of which is made from low-dispersion glass (an ED lens element), which reduces so-called colour errors to a minimum, or, in technical terms, chromatic aberration. In addition to reducing chromatic aberration, the ED lens also provides a more contrast-rich image.
Thanks to their excellent price-to-performance ratio and optimally corrected optical quality, they can be confidently recommended for both long-focus, slower telescopes and faster instruments.
