Jim thanks for this info. My observation but not fully confirmed is that on a 77mm f.length with a 0.37 p.hole size the best I could get was 6+ lp/mm at a distance of about 2m and in front and behind that the dof was very shallow with 3-4m out of focus making me think that the hole should still be smaller. Anyone else have some clear observations regarding this post are welcome.
The newer 3 images at this link without the vignette are with 0.37 and the older 2 with vignette are with 0.42 surprising such a small reduction making such a big difference.
http://www.flickr.com/photos/67202854@N05/