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Focus Mystery


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#1 Will Montgomery

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Posted 07 December 2005 - 08:53 PM

I recently shot this footage on my S-16 modified K-3. The text in the sign was completely in focus through the viewfinder when I began rolling. The first shot is from the first 3 frames which were in focus, then the 2nd still is about 6 frames later where it became out of focus and stayed that way through the rest of the scene. I will of course run a focus test on the camera, but I was interested in what might cause something like this...

Could it be:

1) The pressure plate not pressing the film properly? (I carefully check upon loading to see if its seated properly)

2) Something in the S-16 conversion causing issues? The gate's too big or something?

3) An issue with the transfer house? (this was done on what they call a "Y-Front" at Video Post & Transfer in Dallas, a very good telecine house in this market)

Any ideas would be appreciated, and I will shoot a focus chart to double check with each lens I have.

Attached Images

  • Focus_Mystery_1.jpg
  • Focus_Mystery_2.jpg

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#2 Tim Carroll

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Posted 07 December 2005 - 10:20 PM

1) The pressure plate not pressing the film properly? (I carefully check upon loading to see if its seated properly)


Don't know the K3 but I have seen that happen on other cameras when the pressure plate was loose.

-Tim
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#3 Sam Wells

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Posted 07 December 2005 - 11:02 PM

Don't know the K3 but I have seen that happen on other cameras when the pressure plate was loose.

-Tim



This is my diagnosis also.

-Sam
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#4 Stephen Williams

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Posted 08 December 2005 - 11:00 AM

This is my diagnosis also.

-Sam



Hi,

Find somebody who has an autocollimator, then you can look at the focus on film as it runs through the camera. Playing with the pressure plate at the same time will answer the question!

Stephen
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