The Series IV was a wide angle lens. IIRC, Goerz claimed it covered 100 degrees, but I can't seem to find the brochure on Camera Eccentrics site although the Series IV is mentioned in passing in the earlier Goerz catalog. I think Tracy saaid the 19" covered 20x24 wide open - which I can't test - but the small size and large coverage are very attractive to owners of older banquet cameras like the 8x20 and 12x20 Koronas that might gasp and die with a f:7.7 Dagor attached to it. A picture of my 19" Double Anastigmat Series IV is attached, mounted in a Copal #3 on a Linhof Technika board.

Cheers, Steve