As much as I love Dagors and as many as I've had to play with I never found one that would cover even 8x20 in the 12" focal length. Some folks are happy just to see a blurry and dim image and call it acceptable but thats a stretch in my own wee opinion.
I had about a dozen of the Longer Rectagons a few years ago and one of them went from me to another guy who then sold it to L+R so it may still be the same one. It was called a Goerz Super Rectagon, it looked very impressive but had a look and circle much like the WA Claron. Not that great for ULF and meant only for process photography close up work, the term wide field means something slightly different in that group.
You won't find any cheap alternatives to a Dagor or any lens in the 12" focal length I'm afraid as some have already pointed out. The best way to fake 'wide' is to allow some vignette and falloff to happen. I had a 10" lens that was my holy grail of WA for my 8x20 but when I made my first contact print it didn't look wide at all, no wider really than my standard 14" at the time.
Don't discount the series IV Protar/Anastigmat, they were meant to have less coverage but I found in practical use that the outer edge of their circle was far more acceptable than the series V. The 105/100/95 degree coverage(depending on what catalogue you happen to be reading from) of the IV ended at the 10 1/2" focal length where it was progressively narrowed down to 50 degrees or so for the longer lenses. The 10 1/2" lens only just does 8x20 stopped down so unless you are prepared to do some hyperfocal hi jinx it may not be that way to go. Possibly keep an eye open for a Ext WA Anastigmat Gundlach and various Swiss and Italian copies of the Series IV protar.
CP Goerz
Bookmarks