This medium power Astro-Tech 17mm High Grade Plössl eyepiece is surprisingly affordable, yet gives up nothing in optical performance when compared with eyepieces more than twice its modest price.
The 55° field of view of this 17mm Astro-Tech is surprisingly wide when compared with other Plössls in this focal length range. It’s designed for detailed lunar observing, for getting up close and personal with emission and reflection nebulas, and for resolving globular clusters. It will work well with any telescope type, at any focal ratio, under virtually any seeing conditions.
From a fast Dob to a slow long focal length achro refractor, this Astro-Tech is a sensible choice for the discriminating observer on a budget. Its focal length nicely fills in the gap between the 25 or 26mm eyepiece that comes standard with most scopes and a high power planetary/binary star splitting eyepiece.
The useable eye relief is quite reasonable, but will somewhat vignette the field of view for eyeglass wearers. We can't whole-heartedly recommend this eyepiece for those who want to see the full field while wearing glasses while observing, but many observers will find the performance and price enticing enough to overlook some slight vignetting.
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