For anyone looking at the Lenstip UV filter tests, like any test where a 'score' is generated, it's important to understand the factors that are used to generate that score.
For example, the B+W filter does better than the Hoya on visibile light transmission and flare, whereas the Hoya does better at blocking UV light (the latter accounts for a 5-point difference on their 40-point scale). In fact, if you look at the measured transmission curves, the reason the Hoya does better at blocking UV is that the left side of the bandpass starts at a slightly shorter wavelength - and that means the Hoya filter blocks UV better at the cost of also blocking some of the visible blue light. The Heliopan, on the other hand, is significantly worse than the Hoya in that it blocks even more of the blue light.
As a dSLR user, I don't care about UV blockage, since dSLR sensors are insensitive to UV (my choice might be different if I was shooting film). But I do care about visible light transmission (including deep blues, where the camera's own reduced insensitivity doens't need the filter makeing it worse), and I care about flare. So for me, the B+W is the better choice from an optical standpoint.
Is there an optical difference between...
- B+W 82mm XS-Pro UV MRC-Nano 010M Filter
- B+W 82mm UV Haze MRC 010M Filter
B+W states, " The nano coating is an outer layer of protection that comes standard with all XS-Pro Digital MRC filters. The nanotechnology based characteristic (lotus effect) produces a better beading effect with water making the cleaning of this filter even simpler and faster than ever before. MRC nano has an improved outer (8th) layer over regular MRC."
So, the implication is the the Nano coating provides physical benefits but not optical benefits. I haven't noticed any optical differences between my MRC and my Nano filters.