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flat surface compared to other thin film filters that have wrinkles and creases
Great package for Autoguiding
Aluminum Construction
Viewing through the Celestron TrailSeeker ED 10x42 binocular is comfortable for both eyeglass wearers and non-eyeglass wearers
ZWO FF110 - 110mm f/7 Flat Field APO Refractor - FF110-APO William Optics flat surface compared to otherZWO FF110 APO Flat Field Apochromatic Refractor Main Features Flexible Connectivity for Multiple Configurations Four Element Optical Design The FF110 APO features a four element, fully air spaced apochromatic optical design. All four elements work together to deliver a flat imaging field without the need for an additional field flattener. One ED (extra low dispersion) glass element is incorporated to effectively reduce chromatic aberration, resulting
