[rmuhlack (Richard)]

Originally Posted by Stefan Buda

Hi Richard,

I think the problem is astigmatism caused by the aperture mask being at the wrong place. A complex objective such as a camera lens must have the aperture diaphragm somewhere between the various lens elements, in order to work properly.
Other than that I like the image.

Cheers,

Stefan

Thanks Stefan, that sounds quite plausible. Will check it out