The 6mm Plössl eyepiece from the Skywatcher Eyepiece And Filter Kit (Skywatcher branded version of the Celestron Astromaster Accessory Kit). 15mm Kellner, 6mm Plössl, 2x Barlow, and 3 filters, lunar; #80A blue; and #25 red.
Straight after unpacking the kit, I tried using the 6mm Plössl eyepiece, looking at the moon, as it was nearly a full moon. Dim image, even before I used the lunar filter from the kit. Add to that its poor eye relief, which made it a pain to try to use. After trying the eyepiece, I put it back in the case and have never considered using it again. It just sits in the case, wasting space.
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