Shadows -- NEX-5N & Vivitar 28mm f2.5 [MD]
I think that quite often many people just ignore lenses that are priced very low in the market, thinking that low price equal low quality. This is not always the case, especially with older manual focus lenses. The Vivitars, Soligors, Hanimex, Spiratones, Makinons, etc, all have some quite competent lenses. Of course, not all of them are great, but many are very good value for the money.