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Home > Classifieds > Astromart Classifieds > Eyepieces > Classified #185398

For Sale: --SALE PENDING--EZ Collimating Eyepiece [SOLD]

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This is an eyepiece having a 20-25mm focal length with a bullseye embedded in it. The theory is that you can line up a star in your SCT in the middle of the bullseye and see whether the diffraction rigns are concentric by means of their relationship to the bullseye. I purchased it new for about $100, used it once, and frankly, don't like it. The old fashioned method works best for me. Plus I don't think it's terribly well made (if you look inside the objective you can see glue marks, although these don't seem to affect performance). But others may not agree and might find it helpful. $50. shipped in the continental USA.

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