As I was testing (again) lenses for UV photography, so I ran a few more spectrometric tests now on STEINHEIL lenses, which might be of interest. These are all M42 thread mount taking lenses in silver aluminum barrel.
[click on image to see a larger one]
UV transmission graph:
In terms of UV transmission, all are quite good (except the Culminar) but all exhibit focus shift.
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos