Holger,
Just catching up. Thanks for your detailed reply. Very interesting to know that the 5-10% figures that were being quoted here repeatedly were not from the "Drs" at Zeiss but from informal gatherings which took place a long time ago when Herr Dobler was still working with Swarovski, and that Dobler has no data to support those numbers.
The fact that Swaro underestimated the number susceptible to RB explains the number of people reporting RB in the first generation of SV ELs and why Swarovski is now backpedaling from its initial design and adding more pincushion to the SV EL line, which makes me wonder if the biggest difference in the new ProField SV ELs is not advertized - more pincushion in all models?
After looking at the histogram, I see how you derived your 30% guesstimate. I also took that test but never sent you the results because my dad got sick, went into the hospital for 11 days, and we had home healthcare workers coming in for months afterward while he recovered, and by that time, you had completed your study. But had I sent in my results, you would have had another data point of RB susceptibility to add to the graph.
The odd thing is that when Dobler led the design team that made the Zeiss SF he still thought that RB affected only 5-10%, as he told Lee, so it surprises me that the would go back to that sample group from years back and use them as "guinea pigs" to find the best balance between PC and AMD. Here's what he said to Lee:
We found a good balance between these different things and especially in the control of the so-called rolling ball or globus effect that affects between 5 and 10% of people. We contacted some of these people and asked them to try different binoculars having different levels of field-flattening and we came up with a value that gave the best balance between field flatness and control of the globus effect. This means SF is not quite so flat-field at the very edge but it is nearly so, and from what those people told us almost everybody should be able to enjoy SF without noticing any globus effect.
I can see how Jerry thought he was speaking about a recent study since they used feedback from that group to design the SF.
But some still do see RB in the 8x42 SF, and that can be explained by the distortion pattern rather than the amount of pincushion. As you noted, it's not a simple matter of the k-value with the SV ELs because of its "mustache" distortion pattern but rather how much it dips at the edges that can create the globe effect in some individuals. Apparently, the distortion pattern in the 8x42 SF also causes some people to experience RB.
Brock