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CBC (AMERICA) CORP CG-CBF-1 Neutral Density Filter - CBC (AMERICA) CORP CG-CBF1


CBC (AMERICA) CORP CG-CBF-1 Neutral Density Filter - CBC (AMERICA) CORP CG-CBF1


 

Our Price : $40.18

UPC Code: 781904640126

Product Code: CBC AMERICA CORP CG-CBF1

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Description
 
CBC (AMERICA) CORP CG-CBF-1 Neutral Density Filter - CBC (AMERICA) CORP CG-CBF1


The CBF-1 Neutral Density Filter is used primarily to make the proper back focus adjustments when installing motorized zoom lenses. To assure that a zoom lens stays in focus throughout the zoom range, the camera must be backfocused when lens iris is wide open. The CBF-1 is placed in front of the lens to keep the auto-iris open during adjustment. The filter is 4" x 4" square and made of glass - not plastic - and has an ND rating of 3.0. The CBF-1 filter is an essential tool for the professional installer. Protective case included.

Features
  • For Fixed Focal Length Lenses
  • 1) Attach lens to camera and turn camera power on.
  • 2) Place a neutral density filter (CBF-1) in front of the lens and open the iris
  • to its widest position. (If lens has an auto-iris, the dark filter will cause the
  • iris to open automatically). Note: It is important for the iris to be fully open
  • during the following procedures.
  • 3) Set the focus rings on the lens to the infinity position.
  • 4) View a distant object (the more telephoto the lens is, the farther the distant
  • object should be).
  • 5) Adjust the mechanical focus* on the camera to bring the image into the
  • sharpest focus.
  • 6) After back focus is set, you can adjust focus and iris to desired positions.
  • 1) Attach lens to camera and turn camera power on.
  • 2) Place a neutral density filter (CBF-1) in front of the lens and open the iris to
  • its widest position. (If lens has an auto-iris, the dark filter will cause the iris
  • to open automatically). Note: It is important for the iris to be fully open
  • during the following procedures.
  • 3) Zoom the lens to the telephoto position (?Zoom In? position on the lens
  • controller).
  • 4) Operate the lens focus to get a sharp picture (?Focus Near? on lens
  • controller).
  • 5) Zoom lens to the wide position (?Zoom Out? on lens controller).
  • 6) If picture is out of focus, adjust the mechanical focus* on the camera to
  • bring image into the sharpest focus.
  • 7) You can repeat the above steps to fine-tune the back focus if you need to.
  • 8) After back focus is set, you can adjust zoom, focus and iris to desired
  • positions.

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