I used a Swarovski 30X in the ZEN RAY ED82,..both models,the new and the old ,mounted perfectly,..The Razor and the ZEN seem to be very similar,but If Henry´s eyepiece didnt work in the Razor ,they must have slightly different bayonets...And yet this seems surprising,because I have seen both ,ZEN and Vortex ,30X eyepieces and they seem the same eyepiece .They are using a modified astro eyepiece, after removing the astronomy barrel and fitting the eyepiece with a strange looking bayonet adapter that fits both brands...It would be surprising that the chinese manufacturer of this adapter/bayonet is making one for Vortex and a different one for ZEN,so it must be ,As Henry is pointing in the next post,that both brands are slightly different but close to enough to be interchageable