Hello everyone. I am currently looking for a lens for my KIEV 88. I heard that the 50mm Zeiss Flektogons were great, but kind of expensive. So i decided to look on ebay and there are a lot of 50mm Zeiss Lenses for around 150$. They say they are for pentacon six, kiev, and exakta 66 cameras. Most of them ship from over seas and this seems too cheap. Is there something I should be aware of?