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Message: <blockquote data-quote="dwatsonbirder" data-source="post: 3256110" data-attributes="member: 92203"><p>Hi Binastro they do look very similar, perhaps they share the same origin as those bins. I think they must be a cheaper version of the kowa/opticron/vortex 30mm porros, but I've not used any of these models so I couldn't comment on their comparitive optical performances. They are impressive but I think next time I have a clear out of my optics these will be finding new homes where they are needed in the less affluent and more biodiverse regions of the planet, where tough waterproof optics needed to monitor ecologically important areas are in short supply.</p></blockquote><p></p>