Field stops located at intervals along the inside diameter of the main optical tube effectively block stray, off-axis light rays from reaching the focal plane.
Stellar images appear with textbook-quality diffraction patterns, both inside and outside of focus.
The Moon is an incredibly stark, high-contrast field of mountain ranges, fault lines, clefts, and rilles. As remarkable as the telescope s optical system, the Model 102ED s standard equipment LXD 650 equatorial mounting provides the stability required for serious visual observing, astrophotography, or CCD imaging. Each telescope axis rides on four sealed ball bearings, assuring a precision of motion unattainable on lesser instruments. Perhaps the best tradeoff among the competing factors of aperture, portability, and price, the 127ED presents breathtaking views of the entire range of astronomical subjects. A wide range of photo-visual accessories is available to suit virtually any observing requirement.