Jim -- Are we talking about an "Omegaron"? The original post said "Omegaor", which I interpreted as a misspelling of Omegar, which I still say is "Ohmygod." The Omegaron you own may be another story entirely--maybe a Rodagon with the Omega name on it?
I've *heard* that the 75mm Nikkor is not as good as the 80mm. However, I have not had any personal experience on this one. I owned a 105mm f/5.6 El-Nikkor a number of years back and it was excellent.
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