Laack lenses

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Julius Laack (later Laack Söhne) in Rathenow (Brandenburg, Germany) was first and foremost an optical company making lenses for cameras, binocluars and microscopes. Laack produced a wide range of lenses for still photo and cine camera applications as well as enlargers and projectors.[1] [2] An advertisement in 1934 claimed that over 500,000 lenses had been produced by Laack and Laack Söhne.[3]

Standard Lenses

Atelier Schnellarbeiter

A Petzval type lens[4]

  • Laack 6 cm f/3.5 Schnellarbeiter lens,[5]

Dialytar

This name was used on several lenses of different design and maximum aperture. Greenleaf[2] lists three designs; one is a simple triplet, one (Series T!) a Tessar-type, and one a four-element lens like a Tessar, but with the two parts of the rear group not cemented, and with an air space.

  • Dialytar
    • f/2.7 50mm
      • in Glunz 3x4[6]
    • f/4.5 135mm
      • in Wanderer? 9x12 [7]
    • f/4.5 210mm[8]
    • f/4.5 25cm barrel lens[9]
    • f/6.3 21cm barrel lens[10]
  • Dialytar Series P
  • Dialytar Series T
  • A four-lens Anastigmat with one cemented and one air filled pair
    • f/3.5 15 cm in Compur shutter[12]
    • f/4.5 7.5 cm to cover 4.5x6 [13]
    • f/4.5 10.5 cm to cover 6x9 [13]
    • f/4.5 11.5 cm to cover 6x9 [13]
    • f/4.5 13.5 cm to cover 9x12 [13]
    • f/4.5 13.5 cm in Compur shutter [14]
    • f/4.5 18 cm to cover 10x15 [13]
    • f/4.5 21 cm to cover 13x18 [13]
    • f/4.5 25 cm to cover 28x24 [13]
    • f/6.3 15 cm in Pronto shutter[15]
    • f/6.3 18 dm to cover 10x15 [13]
    • f/6.3 21 cm to cover 13x18 [13]
    • f/6.3 25 cmto cover 18x24 [13]
  • Dialytar Weitwinkel
  • Doppelanastigmat Dialytar
    • f/4.5 13.5 cm in Compur shutter[17]

Doppel-Polynar

A simple double-anastigmat, with two cemented doublets.[2]

Egotar

Egolyt

Extra Rapid Aplanat

Pololyt

A simple triplet.

Polynar

  • Polynar
    • f/6.8 42mm
      • in C.E.Nei Knirps 3x3[39]
  • Polynar C
  • Polynar C1
    • f/6.8 190mm
      • for military application[41]
8220331201_bc50c6257a_n.jpg
Laack Polyplan f/7.2 135mm in Vario shutter
image by Dirk HR Spennemann (Image rights)

Polyplan

A simple double-anastigmat, with two cemented doublets.

  • f/7.2 135mm in IBSO shutter[42]
  • f/7.2 135mm in Pronto shutter[43]
  • f/7.2 135mm in Vario shutter[44]

Polyxentar

A double-anastigmat; either composed of two cemented triplets (f/6.8) or of two triplets with only the outermost pair of each cemented (f/4.5).[2]

Regulyt

A simple triplet.

Texon

  • f/2.7 25mm
    • on a Victor Modell 5 16mm cine camera[45]
    • on a Schalie Collée camera 16mm[46]
  • f/3.5 5.5cm[47]
  • f/4.5 7.5cm [48]
  • f/4.5 10.5cm[49]
  • f/4.5 11.5cm[50]


Cine Lenses

Cine-lens

A Petzval design

  • f/2 15 to 85mm[1]

Cine-Pololyt

A Cooke design for 16mm cine cameras

Cine-Polyxentar

A Cooke design for 8 and 16mm cine cameras

Fineston

details needed [51]

Enlarger Lenses

Definon

An enlarger lens[52]

  • f/4.5 5.5cm to cover 30x40cm[52][53]
  • f/4.5 6cm to cover 40x40cm[52]
  • f/4.5 7.5cm to cover 45x60cm[52][54]
  • f/4.5 9cm to cover 60x60cm[52]
  • f/4.5 10.5cm to cover 60x90cm[52]
  • f/4.5 13.5cm to cover 90x120cm[52]
  • f/6.3 5.5cm to cover 30x40cm[52]
  • f/6.3 7.5cm to cover 45x60cm[52]
  • f/6.3 10.5cm to cover 60x90cm[52]

Super Definon

  • f/3.5 5.5cm to cover 30x40cm[52]
  • f/3.5 7.5cm to cover 45x60cm[52]
  • f/3.5 9cm to cover 60x60cm[52]

Konkretar

Repro-Polyxentar

An Anastigmat-Apochromat with 90º viewangle

Vergrösserungs Anastigmat


Film Projector Lenses

Heleston

Film projector lens [51]

  • f/1.6 2.5cm[59]
    • in Eumig Alter 8 mm projector[60]


8220528777_d5f84fd9bb_n.jpg
Lens Diagram for Laack f/1.35 3 cm (Image rights)

Lens Designs

In addition, there are a number of lens designs on record. It is not clear whether any of these were ever put into production. The wide maximum apertures suggest these are cine lenses.

  • f/1.35 3 cm[61]
  • f/1.4 100 mm Design nº 1[62]
  • f/1.4 100 mm Design nº 2[63]


Links

Notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Kingslake, R (1939) The Development of the Photographic Objective. in: Keith Henney, Handbook of photography. (London: Whittlesey House, pp.37-68, esp. p. 59.
  2. ↑ 2.0 2.1 2.2 2.3 Greenleaf, Allen R. (1950) Photographic Optics. Macmillan, New York. pp82 & 201-8.
  3. ↑ The 50th anniversary of the company is mentioned for 1934: British Journal Photographic Almanac and Photographer's Daily Companion 1934, p309.
  4. ↑ Schnellarbeiter (literally 'fast worker') was a lens design and term appears on Ferrotype cameras by more than one maker.
  5. ↑ On a Ertee 'cannon' camera by Romain Talbot, for 'button' ferrotypes.
  6. ↑ pho-Tony via Flickr
  7. ↑ Laack Rathenow Doppel Anastigmat Dialytar
  8. ↑ brass lens in Reisekamera (Dorotheum Auctions 2011 lot 404)
  9. ↑ Küllenberg Essen Laack s/n 420326;; brass barrel lens, eBay October 2012
  10. ↑ eBay November 2012
  11. ↑ brass barrel lens, eBay October 2012
  12. ↑ Enter-net de
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 13.7 13.8 13.9 Laack Photo-Optik : Bei Tag und Nacht Katalog der Firma Julius Laack Söhne, Rathenow, Werkstätten für Präzisions-Optik und Mechanik [Rathenow]: 1939.p. 12.(seen on eBay)
  14. ↑ Laack Rathenow LP Auktioner
  15. ↑ Stereo Camera, lens s/n 59344) Yeshen Venema's site
  16. ↑ Barrel lens, Laack Rathenow s/n202452; eBay November 2012
  17. ↑ Laack Rathenow s/n 132368 via Flickr
  18. ↑ in IBSO shutter; eBay August 2012
  19. ↑ eBay October 2012
  20. ↑ in IBSO shutter; eBay August 2012
  21. ↑ Brass barrel lens, Breker September 25, 2010 Lot 299
  22. ↑ Brass barrel lens, eBay October 2012
  23. ↑ Christies 2005 Lot 219
  24. ↑ eBay September 2012
  25. ↑ Christies 2005 Lot 218
  26. ↑ ROW Pololyt 1:3,5 f=75mm 602534 in Blitz I shutter
  27. ↑ eBay October 2012
  28. ↑ in IBSO shutter; eBay August 2012
  29. ↑ s/n 128241 Laack-Rathenow via Flickr
  30. ↑ zniv via Flickr.—Gerard Vogels via Flickr
  31. ↑ s/n 222626 K.W. Box Reflex at Early Photography
  32. ↑ eBay September 2012
  33. ↑ Laack Gazelle Tropical 6x9 with Laack Rathenow s/n 151980
  34. ↑ Laack Rathenow s/n 91253 in IBSO (Romanian on-line auction, November 2012).
    Laack Rathenow s/n 102664 in Compur (eBay March 2011).
  35. ↑ Laack Rathenow s/n 112939 in Compur in a Laack Gazelle Tropical via Flickr
  36. ↑ in plate camera; eBay October 2012
  37. ↑ Laack Rathenow s/n 103031 via Flickr
  38. ↑ Now defunct German on-line auction system
  39. ↑ Cjhrisies 2006 Lot 436; Christies 2007 lot 333
  40. ↑ Laack Söhne Rathenow s/n 31072
  41. ↑ s/n 27658 Jul. Laack Söhne, Rathenow
  42. ↑ s/n 17553 "Julius Laack Söhne Rathenow"; loose lens in shutter, eBay October 2012
  43. ↑ s/n 22451 "Julius Laack Söhne Rathenow"; 9x12 plate camera (Wanderer /) in Fotosidans Forum.
  44. ↑ s/n 12938 "Laack" almost square 12 x 9 cameravia Flickr
    s/n 55072 "Julius Laack Söhne Rathenow"; eBay January 2012.
  45. ↑ s/n 195656 on-line Auction Germany
  46. ↑ s/n 195466. Christies 2007, lot 63
  47. ↑ Barrel lens (for enlarger?), s/n 405856 Laack Rathenow; eBay October 2012
  48. ↑ sn 268433 blog.sina.com.cn
  49. ↑ s/n 48xxxx Brass barrel lens (Black Kamera Kan)
  50. ↑ s/n 261977, Laack Rathenow, brass barrel lens, eBay October 2012
  51. ↑ 51.0 51.1 51.2 Laack Photo-Optik : Bei Tag und Nacht Katalog der Firma Julius Laack Söhne, Rathenow, Werkstätten für Präzisions-Optik und Mechanik [Rathenow]: 1939. (seen on eBay)
  52. ↑ 52.00 52.01 52.02 52.03 52.04 52.05 52.06 52.07 52.08 52.09 52.10 52.11 52.12 Laack Photo-Optik : Bei Tag und Nacht Katalog der Firma Julius Laack Söhne, Rathenow, Werkstätten für Präzisions-Optik und Mechanik [Rathenow]: 1939.p. 16.(seen on eBay)
  53. ↑ mentioned in a Flcikr forum
  54. ↑ Laack Anastigmat Definon s/n 409196 via forum.mflenses.—Laack Anastigmat Definon s/n 453110 (eBay August 2011).
  55. ↑ eBay November 2012
  56. ↑ 56.0 56.1 56.2 56.3 Laack Photo-Optik : Bei Tag und Nacht Katalog der Firma Julius Laack Söhne, Rathenow, Werkstätten für Präzisions-Optik und Mechanik [Rathenow]: , 1939.p. 18.(seen on eBay)
  57. ↑ eBay October 2012
  58. ↑ eBay October 2012
  59. ↑ Laack Rathenow s/n 430551 (seen on a Polish auction site)
  60. ↑ Laack Rathenow s/n 470054
  61. ↑ German Patent 665520, filed 20 September 1934 and granted 27 September 1938 to Julius Laack Söhne, Rathenow, at Espacenet, the patent search facility of the European Patent Office.
  62. ↑ Julius Laack Söhne1938 DCE 0 665 520 dioptrique.info
  63. ↑ Julius Laack Söhne1938 DCE 0 665 520 II dioptrique.info
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