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film -- shelf life


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#1 bragis chut

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Posted 29 May 2007 - 01:00 PM

Hi:

I'm sure this had been discussed somewhere but I couldn't find it. Anybody know approximately how long the new Vision 2 stocks (particularly the faster speed stocks like 7218) will last if they're stored properly? I know the faster the stock, the quicker it usually degrades, but beyond that... specifically... how long will 7218 last if it's stored in a cool, dry place?

I've had some stuff myself that tested fine after a year and a half so I know it's good at least that long.

Thanks,

--Gallantyne
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#2 Stephen Williams

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Posted 29 May 2007 - 02:55 PM

Hi:

I'm sure this had been discussed somewhere but I couldn't find it. Anybody know approximately how long the new Vision 2 stocks (particularly the faster speed stocks like 7218) will last if they're stored properly? I know the faster the stock, the quicker it usually degrades, but beyond that... specifically... how long will 7218 last if it's stored in a cool, dry place?

I've had some stuff myself that tested fine after a year and a half so I know it's good at least that long.

Thanks,

--Gallantyne


Hi,

I had slightly raised fog level after 18 months, nothing to worry about for telecine. Rating older 7218 @ 250 asa is probably the way to go.

Stephen
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#3 John Pytlak RIP

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Posted 31 May 2007 - 03:41 PM

Temperature has probably the greatest effect on how fast raw stock deteriorates with age. The cooler, the better. In most cases, refrigeration (less than 10 degrees Celsius) is more than adequate to give years of shelf life, so freezing is usually not necessary. Freezing and thawing has its own set of risks, such as the formation of ice crystals inside the roll, so I usually recommend only refrigeration.

Ambient radiation (e.g., gamma rays, cosmic rays) causes fogging, regardless of storage temperature. Things like local sources of radiation, elevation, and latitude can effect the level of radiation, so don't store your film on a mountaintop or near a uranium mine or radiactive waste dump. ;)
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Media Blackout - Custom Cables and AKS

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