Applications For 'Tamron'

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Troubleshooting Guide

Condition

Unable to focus image.

Solution
  1. First check that the lens mount matches the camera mount requirements.
  2. C-Mount lenses must utilize C-Mount camera settings.
  3. CS-Mount lenses can be used on C-Mount cameras providing a 5mm adaptor ring is used.

Note

Most cameras are C/CS mount selectable. Make sure that the lens mount and camera mount selections match because the rear element of the lens must maintain a precise distance from the CCD imager in order to focus.

 

C-Mount=17.5mm
CS-Mount=12.5mm

 

 

 

 

Conditon

Able to focus image at center, but out of focus at the corners.

Solution

Back focus the camera/lens system. This ensures proper flange back adjustment between the lens rear element and the CCD imager.

Note

Back focus procedures differ for Monofocal adjustments vs. Varifocal/Zoom adjustments.

Monofocal

  • Set the focus ring to infinity.
  • Open the iris (for auto iris lenses this can be done by inserting a gel or filter in front of the lens).
  • Aim the camera at an object that is the same distance as the scene to be viewed.
  • Adjust the back focus mechanism on the camera for the best picture.

Varifocal/Zoom

  • Determine a target subject located close to the M.O.D.(Minimum Object Distance) of the lens.
  • Set the lens to the wide end (mechanical stop) of the focal length range with the iris wide open, then position the focus ring to the nearest distance. Adjust the back focus mechanism on the camera (you are shifting the relative position of the imager) until the target subject comes up sharpest.
  • After the subject comes into sharpest focus, rotate the zoom ring to the tele end without adjusting the focus ring (focus ring remains at the M.O.D. position), then re-adjust the back focus for optimal image clarity.
  • Determine a target subject at a sufficiently far distance (the longer the focal length, the more distance you need), then point the lens at it. This time, turn the zoom right to the tele end with the focus ring set to an infinity position. If you see a clearly focused image, the adjustment is complete.
  • If you see a blurred image, adjust the back focus for an optimal position then go back to step 1. By repeating steps 1-4, you will be able to finish the adjustment.
  • Final Check.Make sure to focus the lens to subjects located at various distances from infinity to the closest distance while changing the focal length setting back and forth between tele and wide ends. So far as the back focus is adjusted properly, the image should stay in focus at all times.

Condition

Auto iris feature malfunction.

Solution

Verify lens iris type (DC or Video iris) and check camera for compatibility.

Note

Most cameras are DC or Video iris selectable. Ensure camera selection is in the correct position for the lens type.

-or-

 

Solution

Check lens pin-out configuration against camera specifications.

Note

This specification can vary from camera manufacturer to manufacturer.