Hi Don, you do seem to have cracked it but I am interested in what you say about the 12-24, I assume Nikkor, because apparently the 12-24 DG Sigma is highly recommended for IR. Here is a link to Nikkor lenses and there use with IR.
http://diglloyd.com/prem/prot/DIP/pu...ses-Nikon.html
Hi Harry, ACS got mine on the 17th April, on Friday they told me another two weeks - so about six weeks at the moment. There is a firm on ebay that advertises conversions for £150, and quotes a week to 10 days turn around. These are the people who told me there was no need to retune the auto focus, just stop down to f8. From my reading, that is why I chose ACS and decided the longer wait was worth it.