1) Nikkor E 2.8/28mm
2) Nikkor-H 3.5/28mm
3) Tokina RMC 2.8/28mm
4) Tokina RMC 2.8/24mm
5) Enna Lithagon 3.5/28mm
6) Noflexar 3.5/35mm
The green vertical line indicates the 365nm wavelength and in that box one can find the transmission at 365nm as the rightmost value. Remember that 12.5% equals -3EV, 25% equals -2EV, 50% eq. -1EV
The 24mm lens is used to show how harder it is to get some useful UV transmission when the focal length and complexity of the lens design increases.
The blue line indicates the transmission of a typical Noflexar 35mm for comparison, about 63% at 365nm. A very good lens for UV which hardly shows any focus shift!
[click on image to see a larger one]
Remark: this test only shows the transmission of a lens, it does not say anything about sharpness, contrast, flare resistance, freedom of hotspots etc. which has to be evaluated additionally through photographic tests before a lens may turn out useful for UV photography!
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