I ran a quick test using my "standard test subject", a roof of the neighbours house against the Coastal Optics Micro Apo 105mm and the Nikon UV Nikkor 105mm. The B&L lens results are shown on the right side of the comparison images. The B&L images have been scaled down to match the shorter focal length of the other two lenses. These are 100% center crops. The Baader U-filter (310 - 390nm) was used for the reflected UV shots. [click on image gets you a larger image]
Here the results in visible light for the UV Nikkor (left):
and for the Coastal Optics 105mm (left):
Here the results in reflected UV light using the Baader U-Filter (310 - 390nm) for the UV Nikkor (left):
and for the Coastal Optics 105mm (left):
So now it is up to you to understand my surprise, how amazingly sharp this B&L lens is....
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