Celestron Omni 6mm

The Celestron Omni 6mm is a short focal length eyepiece designed for high magnification work, making it most useful for planetary observation, lunar detail, and tighter double stars. Paired with a typical 900mm focal length refractor, you are looking at 150x magnification, and with longer focal length scopes the numbers climb quickly, so your telescope's aperture and atmospheric seeing will often be the limiting factor, not this eyepiece. The four-element Plossl design is a proven, well-corrected optical formula, and Celestron has applied fully multi-coated optics and blackened lens edges to squeeze out solid contrast at this price point.

The 50-degree apparent field of view is on the narrower side compared to wider-angle designs, which some observers find limiting at high magnification, but it is a reasonable tradeoff for the cost. Eye relief at 6mm focal length is short, which is typical for any Plossl in this range. Eyeglass wearers may find this uncomfortable, though the foldable rubber eyecup helps somewhat.

For observers without glasses, the viewing experience is generally comfortable. At around $32, this is a genuinely useful eyepiece for anyone building out a starter kit without overspending.