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ACTi TCM-5311 Configuration Note

How to adjust the back focus
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See also: User Manual
How to Adjust the Back Focus for TCM-5311
Category Type
Camera Model
Firmware Version
Publish Date
Last Review
Knowledge Type
Function Type
Contents

Introduction of Back Focus

Introduction of Back Focus
TCM-5311 is a high class camera that has a
built-in back focus ring, by which it is
convenient to fine tune sensor position in
order to achieve the ideal distance of the
sensor from lens.
By rotating the back focus ring it is
possible to slide the sensor back or forth
inside the camera. The back focus ring is
shown on the image 1.
Once the back focus has been adjusted properly, the lens has been successfully
adapted to camera, and there is no need to re-adjust the back focus thereafter. All
the following adjustments are done on the lens itself by changing focal length (zoom)
and front focus, depending on the camera location and the distance to the
monitored object.
Configuration Note
TCM-5311
N/A
2009/09/03
2009/09/23
Video Quality – Correct Focus
Hardware - Lens
Back Focus
Image 2: Back Focus
Image 1: Back Focus of TCM-5311
1

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Summary of Contents for ACTi TCM-5311

  • Page 1 Demo Videos of Back Focus Adjustment References Introduction of Back Focus TCM-5311 is a high class camera that has a built-in back focus ring, by which it is convenient to fine tune sensor position in order to achieve the ideal distance of the sensor from lens.
  • Page 2 Although it is possible to attach almost any C or CS mount lens available, there is a risk that an uncertified lens does not give satisfying result. Two lenses are recommended for TCM-5311. Below you can see the specifications of those lenses. Lens name...
  • Page 3 Also, the lens type will determine the starting position for lens focus and zoom. Below are the step-by-step instructions of adjusting back focus. Before starting the adjustment process, login to Web Configurator and display the live video from TCM-5311 camera. Back Focus Adjustment: Procedure...
  • Page 4 Lens Zoom and Focus Adjustment: Procedure Action View Camera View Result Case 1: We need a zoom-in view from a distance. For testing, put the camera several meters away from the object. In order to zoom-in, change zoom angle to telephoto (T) and then slide focus towards infinity (∞) until you get clear focus.
  • Page 5 The Procedure of Adjusting Back Focus with PLEN-0205 PLEN-0205 is a lens with very deep zoom with the focal length of 8mm - 80mm. Due to its different structure, its wide zoom angle is focused with “Far” instead of “Near”. For better understanding of this difference, you can refer to the graph at the end of this document.
  • Page 6 Demo Videos of Back Focus Adjustment After reading the instructions of back focus adjustment above, you can refer to following videos for hands-on practice: TCM-5311 back focus adjustment with PLEN-0203 TCM-5311 back focus adjustment with PLEN-0205...
  • Page 7 References Below you can find the graphical explanation of the difference of two lenses. On both graphs, the trend line shows the position of focus for each zoom position. PLEN-0203 Focus Scale PLEN-0205 Focus Scale Focus Focus Far (∞) Near (N) Near Zoom Zoom...

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