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Preston FI+Z metric focus pulling?


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#1 christian mann

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Posted 12 November 2011 - 06:08 PM

Hi everyone,

I was wondering if one can change the Preston FI+Z to meters or rather if there are pre-printed focus rings in meters?
I got lenses marked with feet but I am pulling in meters so I would like to make use of the "lens mapping" software but if there are no pre-printed focus rings in meters I am lost.
Any idea how to solve this except making my own rings in meters?
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#2 Chris Flurry

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Posted 13 November 2011 - 02:51 AM

I assume you are referring to a Preston FI+Z 3
If so order the Meteric Rings from preston and switch the Preston to metric.
Select Menu, scroll down till "Lens" is highlighted, the midle soft key should then read "ring", select "ring", this takes you to the "select focus ring" screen, the middle soft key will now read "metric". Select it. Now press the left or back side of the 4 way joy stick which is opposite the run switch twice. Your display will now display where it thinks you lens is set in meters, provided that focus mapping is on. You could also use this display to make your own rings as you had previously mentioned.
Good Luck.
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#3 christian mann

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Posted 13 November 2011 - 03:34 AM

okay, thanks for the info!
now I just need to find out if the rental has the metric rings....doubt it though. we'll see!
thanx
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#4 Michael Kubaszak

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Posted 13 November 2011 - 11:19 AM

If the rental house doesn't have them in metric, do it the old fashioned way! Tape the rings up during prep. Do your witness marks in paper tape then put a layer of J-Lar on top of it to make your marks on.
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#5 christian mann

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Posted 13 November 2011 - 04:20 PM

Hey Michael,
sorry.I'm lost in translation...what are witness marks and what is "J-Lar" ?
I planed on just taping the rings with white gaffer tape and use a non-permanent marker to mark the ring.......
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#6 Michael Kubaszak

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Posted 14 November 2011 - 05:56 PM

Chris,

Witness marks are the distance marks on the barrel of the lens whether in feet or meters. J-Lar is a clear tape that camera assistant's use to make marks on the lens or on a wireless follow focus unit. Whether you use gaff tape or paper tape, tape up the ring with that and(write with permanent ink) start at whatever the lens' close focus is and move to infinity from there. Then put the J-lar on and you can make focus marks on that with a Staedler pen or china marker and be able to remove them easily once done with the shot as water(or saliva on your thumb) will remove the marks. Don't forget to label the ring with the focal length of the lens.
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#7 Chris Flurry

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Posted 14 November 2011 - 10:44 PM

I assume you ment that last point for Christian not me. I am well aware of what a witness mark is, what J-lar is, how to make a Preston Ring, how to mark it and how to clean said marks. Thank You
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#8 Michael Kubaszak

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Posted 18 November 2011 - 09:37 PM

I was. Sorry for the confusion.
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