Last year I bought used metal El-Nikkor F/4 lenses to replace community DR crap 3 element and some F/3.5 optics. I found the F/4 had better contrast than older (somewhat dirty) Leitz F/4.5 optics. In my judgement (no testing data) the Nikkor F/4 performs as well at F/8 as the faster El Nikkor. If enlarging past 8X all bets are off since the F/2.8 is multicoated and 6 elements. The F/2.8 should be better to the corners on a wider range of apertures. The bottom line is the El Nikkor (Tesser) F/4 is a very good lens if used in it's sweet spot.
Last edited by Richard Jepsen; 09-24-2012 at 09:55 AM. Click to view previous post history.