非常有趣的铬色Elmarit f2.8/90mm原型镜头，带独有的预选光圈锁定环，镜头于后期量产版不同，镜片带蓝色镀层。镜头配有OTZFO原型对焦环。在《VIDOM》第20期中有Peter Dorn对本拍品的介绍（杂志随拍品附赠）。 very interesting prototype of the chrome Elmarit 2.8/90 with unique pre-selection diaphragm, the lens head differs to the later production lens, it has a strong blue coating, it comes with a prototype OTZFO focusing ring - both items are illustrated and described by Peter Dorn in VIDOM no.20 (the magazine is included)