I'll put my 2 cents in. I have a 6mm Radian, the wide flat field, generous eye relief and large eye lens are fantastic, although some ghosting is noticeable with my eyes. I believe my 6mm Clave delivers slightly brighter images than the Radian, but then again looking through the Clave is like trying to observe through a straw - it's really uncomfortable compared to the Radian. From posts above, it seem the Pentax may even be better again. Cheers, Fox.
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