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The lens seems similar to those offered by the 'Surplus Shed' in the US a few years back. They went for under $100 from memory. I bought one but have not had much 'luck' getting it to do anything useful.
It is around 6" diameter and was advertised at f0.98 with 200mm focal length.
The Shed also offered a negative lens assembly that was purported to be made for this front lens which if proper placed turned it into a longer focal length assembly of around 800mm. I have tinkered with various combinations and have found that it appears to work with a tube length of around 700mm. The mechanics of getting a suitable tube to hold all the lenses is limiting me at the moment, so I've not progressed very far.
Maybe I'll give the wide angle as shown a try out. But if interested in the eBay version I'd suggest checking out the Surplus Shed first.
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