150mm f4.5 Goerz Dogmar covers 4x5?

[stephan_brunner]

Hello all!

Will a 150mm f4.5Goerz Dogmar cover the 4x5 and, is this lens

recommandable in case of performenc (b/w, landscape)?

 

Thank you

 

Stephan

[thomas_vaehrmann]

as the (mine)300mm covers 8x10 I think it will cover. The Dogmar is a modified 4 lenses/4 elements design developed from Syntor/Celor. It is a litte bit unsymmetrical to correct coma on infinity. As it has 8 glass-air-surfaces it's contrast will be a little low. Due to it's speed there will not be room for movements. Otherwise it's a fine classic lens, enjoy!

[uli_mayer]

Hi Stephan,

its covering power may be insufficient for 4x5. My reference book says, this lens only covers 50? at infinity( H.M.Brandt) . This goes for the American Goerz Dogmar. About the Berlin Dogmar I do not know. The positive thing: Performance may be good when clean. The Dogmar is a lens similar to the Celor and the Syntor and has a bi-convex and a bi-concave lens on each side ( air-spaced ). Mert鬠an authority in lens history, said about it: The Dogmar shows much less flare than Gaus-type lenses and was "so well corrected that it belonged to the best universal lenses, close to the performance of 4.5 or 6.3 Tessars". Why not give it a try if you already have it?

Uli

[uli_mayer]

Thomas,

I am sorry for partly duplicating what you had already posted when I was still writing. Uli

[peter_chiappini]

The dogmar is actually a convertable lens. The front group of elements give 2x focal length and the rear gives 1.5x according to the lens collector's vade mecum. I had one in a compound shutter, that was original to a 9x12cm Goerz Tenax, and it checks out.<P> This is what it says in the vade mecum:<P> Dogmar<P> Dogmar A new dialyt series was announced in Photography 26/05/1914, working at f4.5 in the shorter foci. Since it was very late prewar, most examples will be postwar. Adverts. stressed it was a very highly corrected lens, but the major sales feature was that it was separable, the front cell giving 2x focus, and the rear one 1.5x focus. It was said to be free from ghosting, and the f4.5 was initially made in up to wholeplate size, the longer sizes being in f5.5. It covers 55? or 54? at full aperture, and 60? at smaller apertures. It was suggested to use 21cm for 13x18cm plate. The f5.5 covered a slightly larger angle (54-60?) and a slower version at f6.3 covered a bit more again (60-65?). However it was not primarily sold for its angle of cover, and the slower version was short lived, being replaced by the Tenastigmats, etc. The designer was W. Zschokke, and it was covered under Patent 258,494 and sold from 1914. It is sharper than Celor, and shows better edge detail than the Q15 type designs. [Zschokke then left Goerz after the association as Zeiss Ikon, and designed rather similar lenses for Kern, possible perhaps due to the take over by Zeiss Ikon and the absence of this lens type in the Zeiss lists.] Dogmar f4.5 60, 75mm for 2.375x2in, 90mm for 2.75x2.375in, 100mm for 2.5x3.5in, 125mm for 4.25x3.25in, 125mm for 4.25x3.25in, 135mm for 4.25x3.25in, 150mm for 4.75x3.5in, 165mm for 5x4in, 180mm for 6x4in, 195mm for 6.5x4.75in, 210mm for 7x5in, 240, 270, 300mm. Use 165mm for 5x4., 14in for 10x8. (Goe005,009. Q26 type). Separable, 3 focus. It covers 55? and there is no suggestion of improved cover when closed down. The other foci of the single cells were not detailed in adverts. (eg B.J.A. 1925, p739)

[peter_chiappini]

the question marks after the numbers should be degree signs...