This lens is a double gauss 6/5 design, with a doublet as the very last element. It is highly appreciated among large format enthusiasts as it will cover the 4×5 inch frame. It also has very characteristic double-gauss bokeh, rather rare in lenses of this focal length (178mm). It is relatively easy to adapt to almost anything because of its long flange focal distance, therefore an ideal lens for DSLR enthusiasts. Various adapters are made for it. I rarely use the lens because I have the Dallmeyer 8 inch f2.0, but this lens gives a similar bokeh at a fraction of the price.
