I think the older caltar 90's are super angulons. The newer Caltar-II N 90mm f/4.5 and f/6.8 are the same as the Rodenstock Grandagon N's of the same specs. I have the 90 f/6.8 Caltar-II N (Rodenstock Grandagon N) and it's a very nice lens, I'd highly recommend it. The movement range is very generous; you can get a lot of shift. I can't remember the specs exactly (they're on the front page of LFinfo somewhere), but I think the image circle is around 210mm. Enough to almost shift the horizon to the ground on 4x5 in portrait orientation - ie, perfectly fine for shooting architecture from ground level.
I paid about $400 for mine on ebay, I've seen them go for between $300 and $500 depending on the mood of the zeitgeist.
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