Peter I agree with you. TeleVue do suggest 6, 8, 13, 21 as a logical sequence. After all the great advice that's what I have decided to stick with. But just the 13 and 21 in the Ethos. I've heard the eye relief gets tighter in the shorter focal lengths, which I don't think I will like.
Still haven't had the chance to use the Delos. First impressions are that it is a great looking eyepiece and the sliding eye cup design looks really good. If it is just as nice to use, I will grab some more shorter focal length ones while they are on sale. Fingers crossed for tonight.
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