Xipho
19-Feb-2017, 01:28
Hello,
I got my hand these days in Dresden on a very nice Ernemann Heag II Ser II 9x12 cm Camera which I would date after some research and comparison to 1918, maybe 1919 (has a350xxx Camera serial and still the old "Sungod" logo).
The camera came with its Ernemann Anastigmat "Ernar" 6,3/135 mm Nr I.
As the literature did not provide me any results for the construction type of this Ernar, I did some examination.
The two cells of the lensare very different from each other, and the Designation "Anastigmat" for the whole system is right, it is no Doppelanastigmat as I can show later.
The front cell is thicker than the rear cell, has, if you eyetest it as a loupe, a different focal length and very different correction properties.
It has two strong reflexes and on tiny (I searches for a second one but could not find it yet)
So with this pattern it should be a cemented dublet. In eyetesting, it shows that it is not sperically corrected, the view is extremly bent at the corners. Group is outside front concave, rear convex. I can,t get any sharp picture on the matte screen with it ...
The rear cell is thinner and also shows 2 strong and a weak reflex. Also a cemeneted dublet (here I am abolutely sure that it not a cemented triplet!) This group is spherically corrected.
Groupe outside is front convex and rear concave). It has a stand alone focal length of app 150mm
Im resaerch in my classic lens optic books I found only one simliar lens.
this would be the classic (not doppel) Protar from Zeiss 1890ff.
The classic basic Protar has a Old Achromat (thinner) cemented dublett in the front, Classic Landschaftslinse or half of a Aplanat.
Rear group of the Protar is a thicker New Achromat (Neuachromat) and not spherically corrected.
Zeiss made the most famous series as 1:9 and 1:18 (WA), the Westlake book lists:
1890 Ser III F 7,2 DD (doublet/doublet), Ser IV F 12,5 (DD), Ser V F18 (DD)
1891 Ser I F 4,5 (DT), Ser II F6,3 (DT), Ser IIIa F 9 (DD, the bwest known)
1893 Ser IIa F 8 /DT)
Could my Ernar be a reversed mounted Protar II (maybe for patent reasons). Ernemann started making own lenses in 1908...
(I also found some doppelanstigmat called Ernar in the internet, but a 1925 camera, so maybe the name Ernar switched later to different lens types. So her I only refer to the "Anastigmat Ernar")
I have not found any hint of such a reversed Protar in the literature. Maybe one of you has some more information... The real Protar was licensed to some companiea, incl Bausch&Lomb and Ross. By 1900, 100.000 licence anastigmats had been made...
I tried to identify the different ernemann lenses, has any one of you more information here?
(until now I can say the "Ernotar" must bei a Tessar (thanks to Ron's data of his lens), the famous 1.8/2 Ernostar is well known as the Sonnar predecessor), the DA Ernon might be a classic Dagor, the DA Vilar a normal Dialyt...) , Detectiv Aplanat is self explaining, Ernoplast and Ernastigmat (triplet??) unknown. Still searching for more here...
any ideas or hints to my Ernar are very welcome!
Thanks from Germany
Harald
I got my hand these days in Dresden on a very nice Ernemann Heag II Ser II 9x12 cm Camera which I would date after some research and comparison to 1918, maybe 1919 (has a350xxx Camera serial and still the old "Sungod" logo).
The camera came with its Ernemann Anastigmat "Ernar" 6,3/135 mm Nr I.
As the literature did not provide me any results for the construction type of this Ernar, I did some examination.
The two cells of the lensare very different from each other, and the Designation "Anastigmat" for the whole system is right, it is no Doppelanastigmat as I can show later.
The front cell is thicker than the rear cell, has, if you eyetest it as a loupe, a different focal length and very different correction properties.
It has two strong reflexes and on tiny (I searches for a second one but could not find it yet)
So with this pattern it should be a cemented dublet. In eyetesting, it shows that it is not sperically corrected, the view is extremly bent at the corners. Group is outside front concave, rear convex. I can,t get any sharp picture on the matte screen with it ...
The rear cell is thinner and also shows 2 strong and a weak reflex. Also a cemeneted dublet (here I am abolutely sure that it not a cemented triplet!) This group is spherically corrected.
Groupe outside is front convex and rear concave). It has a stand alone focal length of app 150mm
Im resaerch in my classic lens optic books I found only one simliar lens.
this would be the classic (not doppel) Protar from Zeiss 1890ff.
The classic basic Protar has a Old Achromat (thinner) cemented dublett in the front, Classic Landschaftslinse or half of a Aplanat.
Rear group of the Protar is a thicker New Achromat (Neuachromat) and not spherically corrected.
Zeiss made the most famous series as 1:9 and 1:18 (WA), the Westlake book lists:
1890 Ser III F 7,2 DD (doublet/doublet), Ser IV F 12,5 (DD), Ser V F18 (DD)
1891 Ser I F 4,5 (DT), Ser II F6,3 (DT), Ser IIIa F 9 (DD, the bwest known)
1893 Ser IIa F 8 /DT)
Could my Ernar be a reversed mounted Protar II (maybe for patent reasons). Ernemann started making own lenses in 1908...
(I also found some doppelanstigmat called Ernar in the internet, but a 1925 camera, so maybe the name Ernar switched later to different lens types. So her I only refer to the "Anastigmat Ernar")
I have not found any hint of such a reversed Protar in the literature. Maybe one of you has some more information... The real Protar was licensed to some companiea, incl Bausch&Lomb and Ross. By 1900, 100.000 licence anastigmats had been made...
I tried to identify the different ernemann lenses, has any one of you more information here?
(until now I can say the "Ernotar" must bei a Tessar (thanks to Ron's data of his lens), the famous 1.8/2 Ernostar is well known as the Sonnar predecessor), the DA Ernon might be a classic Dagor, the DA Vilar a normal Dialyt...) , Detectiv Aplanat is self explaining, Ernoplast and Ernastigmat (triplet??) unknown. Still searching for more here...
any ideas or hints to my Ernar are very welcome!
Thanks from Germany
Harald