I just acquired a number of eyepieces being sold by someone getting out of the hobby. One of them is a Carton 6mm ortho and it's a cracker. Mint condition and very sharp. Had some great views of Jupiter with it on Friday night.
Usually I see orthos described as either 'volcano top' or 'flat top'. This one is kind of a hybrid so not sure what to call it. But it works well and is comfortable to use.
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