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The ones I used to have had a better field that a good Plossl but I did not have a 4mm in my Celestron X cell lx (60 deg) to compare to a reasonable eyepiece only a 5 , the 10mm and 25 did not work for me but as mentioned at that price even if one works its ok
These are the yellow top, wonder what the red top will do
By the way I took the 10mm apart one single and one cemented double all glass
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