[earleygallery]

Actually the Summar copes very well at f2 also and has a lovely bokeh.

As it is a Summar the 'cloudyness' may also be fine scratches to the elements. What does it look like if you shine a torch through it?

The Summar is often referred to as a soft lens. In fact, the glass it was made from is a soft variety and easily scratched. This in turn will lead to 'soft' images. If you have a clean example it is a very nice lens indeed - damaged lenses are still interesting as a kind of special effect lens.