400mm= lens 800mm on Panasonic G lumix HD Micro 4/3 PEN OMD GX8 GH4 GH3 GH2 G3 a 400mm lens for £55?! Must be a basket case right? Or no? if you search for panasonic lens | eBay there's lots of similar ones from different sellers and slightly different but similar looks but with the exact same, fairly badly written, description. Must be a catch. What's wrong with it? What make is it? Can I damage my camera by putting a dodgy lens on it? (assuming I don't force it on if it clearly doesn't fit) Any reason why I shouldn't buy it?