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SDI Connector or Cable Breakage

Keep an eye out for bent center conductors in your BNC cables. The SDI inputs are susceptible to breakage, (as anyone with a LH900 knows) and a bent center conductor on a cable will take out the connector on a single insert. So if you have a broken SDI connector, inspect your cabling, before it breaks again! 

 

Back Focus or Flange Back  

We’ve had quite a few inquiries about this procedure, and several had attempted, but were having problems, so they are for typical setup and fixed lens. 

 

With a typical ENG lens, I would recommend these steps: 

 

1)  Turn off all auto functions, Iris, focus etc.

2)  Use a Seimens Star Chart if possible.  Click to download.

3)  Place the chart normally about 10 feet from the lens, Wide angle lenses around 6 feet, and extreme Tele around 15 feet.

4)  Open the Iris Fully; use the shutter or ND filters to limit the light to an acceptable range. (you should be able to fully discern the chart at both ends of the range)

5)   Zoom in full telephoto end and focus.

6)   Loosen the back focus ring securing screw, then back out to the full wide end and use the back focus ring to focus.

7)   Repeat steps 5&6 to obtain optimal focus at both ends of the zoom range.

 

NOTE: do not over tighten the Back focus securing screw - it will damage the ring.   

 

 

Performing Back focus with Fixed lens cameras is different and sometimes only accomplished by a servicer or the manufacture: 

 

With the PMW fixed lens cameras, Sony has included a FLANGE BACK procedure in a hidden menu.  The menu is hidden because improperly performing back-focus can make a perceived problem a real problem.  That said, if you are sure your camera is not back focused properly, here are the ways to access the menus in the current EX fixed lens cameras: 

 

Accessing the menus: 

 

PMW-EX1: 

 

“Displaying the SERVICE Menu 

·   To display the SERVICE menu, press the CANCEL button, the MENU button and the JOG dial at the same time.(Pressing the MENU button again closes the SERVICE menu)

·   Once the SERVICE menu has been displayed, simply pressing the MENU button displays the SERVICE menu instead of the normal SETUP menu unless the power is turned off.” [1]

 

 

PMW-EX1R 

 

“Displaying the SERVICE Menu 

To display the SERVICE menu, the following operations are needed. 

1.      Close the LCD monitor.

2.      Set the LCD B.LIGHT switch on the upper operation panel to the “OFF” position.

3.      Set the GAIN switch on the side operation panel to the “H” position.

4.      Press the CANCEL button, the MENU button, and the Jog dial at the same time.

5.      When the LCD monitor is opened, the SERVICE menu is displayed.(Pressing the MENU button again closes the SERVICE menu display)

·         Once the SERVICE menu has been displayed, simply pressing the MENU button displays the SERVICE menu instead of the normal SETUP menu unless the power is turned off.” [2]

 

 

The Procedure: 

 

1)      Turn off all auto functions, Iris, focus etc.

2)      Move the front focus ring to the Manual, (back) position.

3)      Use a Seimens Star Chart if possible.  Click to download.

4)      Place the chart normally about 10 feet from the lens. If the procedure does not produce acceptable results, try different distances, from 6-15 feet.

5)      White balance.

6)      Open the Iris Fully; use the shutter or ND filters to limit the light to an acceptable range. (you should be able to fully discern the chart at both ends of the range )

7)      Zoom in full telephoto end and focus.

 

From the SERVICE menu, select ‘Auto FB Adjust’ and execute.   After complete, verify the results by Zooming in and focusing tight then verifying full wide stays in focus.  Remember this is not a 20,000 dollar lens… 

 

Back focus with the PMW line is menu driven at this point, but setting up a chart with proper lighting is essential.   



[1] From the Sony Pmw-Ex1 service manual 

[2] From the Sony Pmw-Ex1r service manual 

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