I'm just testing the waters here, but I'd like to know if there would be much interest in a large comparison test of many different enlarging lenses (conducted by me), and whether also anyone would be willing to cooperate with the loan of lenses? For a while now I've been taking advantage of the rock-bottom prices of darkroom gear on the secondhand market, and buying up high quality enlarging lenses. I don't really need most of them, but optics is my first love (even before photography) so I'm indulging myself a little. Anyway, as I now have a number of lenses of different makes in each of a few different focal lengths I thought I would set about actually comparing them to see if any useful conclusions could be drawn about the various marques, or whether there isn't really much of a difference at the top. I currently have a good number each of Componons, Rodagons, and EL Nikkors, to cover formats from half-frame up to 5x4, with a couple of one-offs from other manufacturers. But there are some notable absentees from the ranks of my collection, like Rokkors, for instance, or Neonons, and so on. And of course, there's always the possibility of sample variation, so even if I already have a 50mm f/2.8 EL Nikkor, for instance, it could still be useful to have access to another in order to strengthen the results. So, I was wondering, if I were to forge ahead with a large scale comparison test, would any owners of other lenses be willing to lend them for a few days at a time so they could be included? The test wouldn't stand or fall on that - I think I have enough lenses of my own to make it worthwhile doing something - but it would be nice to cast the net wider if possible. So, anyone think they might be willing to let me have a lens on loan at some point? If it make any difference, this isn't going to happen in the next few weeks - I envisage probably completing the initial phase sometime in the next six months, maybe. After that other lenses could be added to the database as and when they become available.