While I have been looking for a Dagor I have seen a lens called a Dogmar.
Are they are the Goerz offering of the 'Tessar' construction?

Quote:

On 2004-03-23 00:56, primus96 wrote: While I have been looking for a Dagor I have seen a lens called a Dogmar. Are they are the Goerz offering of the 'Tessar' construction?

You're in the UK, think 'Aviar' as in Taylor Taylor & Hobson's Cooke Series II (not to be confused with TTH's Cooke Series II Anastigmat, which is a triplet). TTH's naming convention is a little muddled. In other words, dialyte. Not a tessar type. More or less a tessar's front cell in front of the diaphragm and another of the same turned around behind the diaphragm. The glasses are (( )( | )( )) where | indicates the diaphragm. Four air-spaced glasses. Goerz' first version was called a Celor. More muddle.

Cheers,

Dan

My understanding has always been that the Celor/Dogmar line was the seed for the Artar. (?)

Quote:

On 2004-03-23 12:18, glennfromwy wrote: My understanding has always been that the Celor/Dogmar line was the seed for the Artar. (?)

The Vade Mecum dates the Celor design to around 1898-9, the Dogmar to 1914-6, the Artar to 1914. It isn't clear that the Dogmar and Artar are developments of the Celor, but they're all in the same family. TTH's Aviar came slightly later, although the Vade Mecum said that H. D. Taylor had that design in mind when he designed the Cooke Triplet.

Not that any of this matters very much, they can all be useful lenses.

Cheers,

Dan

I have recently bought, very cheaply, a Goerz Dogmar f/6,3 165mm in a Compur shutter. The front element is marked but it seems to perform well nevertheless. I use it in my MPP 5x4, but it also works on my FKD (Russian) 13X18cm but with fairly soft corners. I suspect it was intended to cover more than 5X4 but someone may know otherwise.