The Protar VIIa Zeiss Patent double anastigmat lens is a combination of 2 Protar VII single anastigmats, one in front of the aperture and the other behind the aperture. In this case we have a 16⅛" single protar at the front and a 11 3/16" single protar at the back. Both of the single groups are designed to work at f12.5 alone. Combined they create a 7½" combined focus of f7.7 maximum aperture. Yesterday afternoon I noticed the light of the setting sun coming in the tailgate of the Woody and quickly made the 3 images you see here on 5X7 inch film.
When working with the single anastigmats alone it's best to put them behind the aperture. These were all done about f22½ Tripod in same spot all 3. The Ford Station Wagon is a NO SMOKING zone!
cowboy hat #4
VIIa #9 hempen @ 7½" combined focus
cowboy hat #5
VIIa #9 hempen @ 11 3/16" single protar vii anastigmat focus
cowboy hat #6
VIIa #9 hempen @ 16⅛" single protar vii anastigmat focus
The Protar VII was marketed as a direct competitor to the Goerz Dagor. The Dagor had to be symmetrical to work well, and the single groups of a Dagor used alone were poor at best even though it was marketed as a "doppel anastigmat" it really wasn't.
The Zeiss lens could be mixed and matched with different combinations and was fully corrected as a single component lens.
. . . with apologies to Andrew Glover; aka dagor77
POST YOUR PROTAR VII PICS PLEASE
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