Title: Performance of the Celestron 40mm Axiom Eyepiece
Review: This 2" barrel eyepiece from Celestron represents a moderately-priced alternative to ultra high-end offerings from other manufacturers. The generous 70-degree apparent field of view provides breathtaking views of star clusters and extended deep-sky objects. Tested in a Celestron C14 SCT operating at f/11 and at f/7. Also with a 17.5" f/4.5 Newtonian. Performs very well at f/6 and above. Below f/6, some sharpness is lost in the outer 15% of the field. Excellent value for the money.
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