Pinhole for UV II (infinity)? ... not for me

Now a second pinhole VIS + UV test, at infinity now. I used a laser drilled very fine brass pinhole with f180 and one with f240. Camera was a Nikon D70 @ ISO400.

Visible image using the f180 pinhole first, unadjusted except for size, exposure about 1/4 sec:



Now the f180 UV image (whitebalanced), exposure about 30sec, but enhanced by 100% lightness i.e. like 60sec exposure:



Visible image for the f240 pinhole, unadjusted except for size, exposure about 1/4 sec:



Now the f240 UV image (whitebalanced), exposure about 30sec, but enhanced by 100% lightness i.e. like 60sec exposure:



So and the conclusion now? The f240 is somewhat sharper, but still, no pinhole for UV for me, also not for infinity or landscape 
work. As said before, maybe for artistic landscape work. But it works very 
well to show that the camera sensor needs urgent cleaning!

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