ELCAT

Production era - 1928-1930
Type - No. 1 supplementary front close-up lens for Compur Leica (model B) with 1:9 maximum reduction at 39 1/2 - 21 3/4 inch range.
Evolution
Close-focus series for early Compur lenses
- ELCAT
  - Reduction - 1 /9
  - Distance to camera - 55 to 100cm
- ELCOM
  - Reduction - 1 /6
  - Distance to camera - 39.4 to 55cm
- ELCUR
  - Reduction - 1 /3.6
  - Distance to camera - 26.7 to 31cm

Close-up lenses for 5 cm Elmar
- 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
- (Note: not to be confused with similar lenses for R-camera usage - see ELPRO)
- 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 - Page 40 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus.

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