ELPRO

• Names - Type 1 (16541) - Type 2 (16542) - Type 3 (16543) - Type 4 (16544)
• Use - Close-up attachments lenses for R-lenses 50 mm f/2, 90 mm f/2.8 and 135 mm f/2.8
• Mount - to fit in filter thread of lens and similar sizes may be stacked for greater magnification
• Evolution
  • ELCAT - 1928
  • No. 1 - ELPRO and related lenses originating about 1930, are used for close-up photography for Elmar (I) f= 5 cm 1:3.5 used with BEHOO type adjustable legs. Because legs are attached to the leading edge of the lens they can be rotated with the camera when taking a picture. From the 1933 catalog :
    • Object size - 21 x 31cm to 42 x 63cm
    • Distance to camera - 55 to 100cm
  • No. 2 - ELPIK
    • Object size - 14 x 20.5cm to 21.5 x 32cm
    • Distance to camera - 29 to 55cm
  • No. 3 - ELPET
    • Object size - 8.4 x 12.5cm to 10.7 x 16.1cm
    • Distance to camera - 26 to 31cm

• For Hektor f= 5 cm 1:2.5 & Summar f= 5 cm 1:2 lenses
  • No. 1 - HEPRO
    • Object size - 21 x 31cm to 42 x 63cm
    • Distance to camera - 55 to 100cm
  • No. 2 - HEPIK
    • Object size - 14 x 20.5cm to 21.5 x 32cm
    • Distance to camera - 29 to 55cm
  • No. 3 - HEPET
    • Object size - 8.4 x 12.5cm to 10.7 x 16.1cm
    • Distance to camera - 26 to 31cm
• Reference - Laney's 1984 Accessory Guide see pages 30 and 40 for other versions
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