Are all Goerz Double Anastigmats Dagors?

[pkrpkr]

What they say in another catalog is that the Hypergon is distortion free but not corrected for "aberrations spherique et chromatique". Their argument is that it's not necessary to correct because the effects are insignificant given the large angle and small aperture used in practice (if I understand correctly).
The drawing of the glass doesn't show combined lens elements, just 2 symmetrical solid pieces of glass.

[Dan Fromm]

That's all the Hypergon is. A pair of very deep meniscii.

[Jim Noel]

After having to turn down a chance to buy one on an 8x10 Kodak years ago I have wished that someone would make this lens once again. The view through that one was magnificent. The price was little more than the value of the camera, but in those days I still had 4 children at home.

[Drew Wiley]

Dagor design implies a symmetrical pair of cemented triplets. According to Kingslake, there were a couple of ways to do that (original vs reversed Dagor), but these did NOT include anastigmats, dialyte Celors or Alethars, early Angulons, etc, because all of those had airspaced elements, which Dagors did not. Hypergons are another kind of animal entirely, double extreme meniscus. Fun stuff. Kingslake's History of Lenses has kept me sane on more than one long boring airline flight.

[Mark Sawyer]

That's all the Hypergon is. A pair of very deep meniscii.

Definitely. Is a small aperture and wide field enough to correct astigmatism? Or does that combination make astigmatism irrelevant regardless? Or did engraving it on the lens just sell more lenses?

Math says a single meniscus lens has astigmatism. But half a Hypergon is a pretty extreme single meniscus.

I dunno...

[Mark Sampson]

It may be that the Goerz' customers didn't care much about the label. If they needed that ultra-wide field of view, the Hypergon was their only choice.

[Luis-F-S]

Double Anastigmat GOeRz = Dagor

[David Lindquist]

C.P. Goerz American Optical Company revived the Hypergon name circa 1960. A June 1, 1960 price list shows the "Goerz Hypergon F:22 or F:32 Fixed Stop" described as "A special lens for mapping, plotting and rectifying equipment, for military and industrial applications." Available in focal lengths of 127, 135 and 168 mm plus "Special sizes to order." "Prices on request." No indication if this revives the original design. Stated coverage of 90º is much more modest than claimed for the original Hypergon. The same price list asserts 100º for the "Wide-Angle Golden Dagor." The Hypergon is not shown on a March 1959 nor a December 1964 price list.

David

[Drew Wiley]

I thought the corrected aerial mapping versions were called Metrogon.

[Tin Can]

Glennview with Hypergone story and Image

I believe Glenn as we have had a few in person discussions