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imperial to metric conversion strips/scales for lenses.


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#1 Gareth Roberts

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Posted 15 May 2009 - 10:56 AM

Hello,

I would like to find out about conversion strips for lenses. Hypothetically I've got a set of imperial scale lenses and a focus puller who wants to work in metric. The letraset strip idea won't work because the DOP is worried about the letraset strip slipping in weather etc. Bringing in a set of metric scale lenses won't work because of cost, etc. Is there an industry standard set of clip on lens scales that will solve this? Oh, and I don't know what lenses will be used. Shooting on arri sr's from Panny Canada, or PS Canada.

Sorry if this is vague, but that is the way it was presented to me.

Thanks,

Gareth :ph34r:
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#2 Stuart Brereton

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Posted 15 May 2009 - 11:31 AM

Easiest way would be to re-measure and mark your Focus discs in metric. I've never heard of conversion scales.

Zeiss Superspeeds are marked in both metric and imperial, if I remember right.

I'm curious though, what benefit is there to working in metric? Distance is distance, and Imperial is industry standard.
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#3 Gareth Roberts

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Posted 15 May 2009 - 08:47 PM

Easiest way would be to re-measure and mark your Focus discs in metric. I've never heard of conversion scales.

Zeiss Superspeeds are marked in both metric and imperial, if I remember right.

I'm curious though, what benefit is there to working in metric? Distance is distance, and Imperial is industry standard.


I think that they want to use Master or Ultra primes and an E.U. focus puller.

Gareth
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#4 Satsuki Murashige

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Posted 16 May 2009 - 02:43 AM

I think that they want to use Master or Ultra primes...

I might be mistaken, but I seem to recall reading that the Master Primes are very easy to convert from imperial to metric and vice versa. All the rental house has to do is flip the front housing which has metric scales engraved on the opposite side. It would be worth calling them and asking if this is possible since rescaling the lenses yourself would be a pain.

Separate issue, but the Master Primes may not actually fit on an SR. I've never tried to do it but it would be a very tight fit because of how close the SR viewfinder is to the lens mount.
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#5 John Sprung

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Posted 16 May 2009 - 03:05 AM

I might be mistaken, but I seem to recall reading that the Master Primes are very easy to convert from imperial to metric and vice versa. All the rental house has to do is flip the front housing which has metric scales engraved on the opposite side. It


That's correct for Master Primes. The ring with the scales on it comes off and you turn it around. It's imperial on one edge, metric on the other.





-- J.S.
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#6 Gareth Roberts

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Posted 16 May 2009 - 05:39 AM

That's correct for Master Primes. The ring with the scales on it comes off and you turn it around. It's imperial on one edge, metric on the other.





-- J.S.


That is interesting to know.

Thank you.

Gareth
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#7 Chris Keth

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Posted 20 May 2009 - 06:50 PM

Call the rental house about it. Master primes are very easy to swap over. I've heard that many rental houses here have ways of switching the markings on their lenses for customers who prefer metric.
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#8 John Sprung

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Posted 20 May 2009 - 07:46 PM

Master primes are very easy to swap over.


Have a look at page nine of this PDF:

http://www.zeiss.com...es_brochure.pdf

It shows how you pull the cylinder with the scales on it, and flip it over.




-- J.S.
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