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HOW TO "TRADE DOWN" LENSES


  Lens Format   Camera Format
  Multiply Lens Focal Length by
  1"   2/3"   1.45
  1"   1/2"   2.0
  1"   1/3"   2.91
  2/3"   1/2"   1.37
  2/3"   1/3"   2.0
  1/2"   1/3"   1.45

Example 1
1" format 12.5mm lens on a 1/2" format camera.
12.5mm X 2.0 - 25mm
The picture shown on the monitor using the above example will be the equivalent field of view of a 25mm lens on a 1" camera

Example 2
2/3" format 7.5mm lens on a 1/2" format camera.
7.5mm X 1.37 = 10.275mm
The picture shown on the monitor using the above example will be the equivalent field of view of a 10.275 mm lens on a 2/3" camera.

Example 3
1/2" format 3.5mm lens on a 1/3" format camera.
3.5 mm X 1.45 = 5.08mm
The picture shown on the monitor using the above example will be the equivalent field of view of a 5.08mm lens on a 1/2" camera.

Note: You can always trade down lenses to smaller format cameras, not up. Trading up a smaller format lens to a larger format camera will result in a porthole effect in the picture.




Tekstar Optical, Inc.  |  75 Lackawaca Hill, Napanoch, NY 12458  | 
Phone/Fax: 845-647-5367 (LENS)  |  Cell: 516-582-3458
Email: info@tekstaroptical.com