That's made a fair difference, although there's still some evidence of the problem. Shouldn't be too bad to take it out manually though.

It looks like the only way to cope with this problem is to reduce aperture from current f5 to something like f8 or f11. Right, I shall give that a try, thanks. Sweet spot on this lens is supposed to be 5.6 according to some sites (I read it on the internet so it must be true!). Nikkor 105mm FYI. Bl...

I think I can see *what* is happening in the stack, but I'd appreciate some suggestions on how best to work around it. In the stack (that's uploaded to your ftp server in a folder with this username) it appears that the foreground section of the ring in particular is being used when out of focus. Th...