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GrahamNR17
Joined: 17 Jan 2009
Posts: 1855
Location: Norfolk, UK
Expire: 2012-09-06
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 Posted: Sun May 03, 2009 7:05 pm Post subject: Polyester is NO good! |
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GrahamNR17 wrote:
I recently returned to using Adox CHS film (this is the stuff that was Efke, made in Croatia). I adore it. It is one of the last remaing proper high-silver content films.
I was really dismayed when I got my latest batch and discovered a label on the carton stating "NEW CLEAR POLYESTER BASE". I work as a lab technician in film coating technology, and I already know that Polyester is a nightmare for static electricity generation. Celluloid materials that film are usually made from is not a problem, as it has a high moisture content and the static can dissipate before it has a chance to build up. Polyester is an oil based film and has no moisture content at all. We have spent many thousands of pounds eliminating static build-up on our films in the factory.
So, just three films in to my new batch, and I have started getting static discharges in the film, and it is wrecking some frames.
This is a classic static discharge pattern. I fear that I have used my last Adox 
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Sevo
Joined: 22 Aug 2008
Posts: 1189
Location: Frankfurt, Germany
Expire: 2012-12-03
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| Posted: Sun May 03, 2009 8:22 pm Post subject: |
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Sevo wrote:
Polyester base is incredibly wide spread on large and medium format film, and has been for many years. I haven't had any issues with them, but then, these films are back-coated, while 135mm is blank and uses a felt-lipped cartridge - which both increase the risk of static discharges.
Sevo |
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Laurence
Joined: 26 Mar 2007
Posts: 4809
Location: Western Washington State
Expire: 2016-06-19
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| Posted: Sun May 03, 2009 8:27 pm Post subject: |
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Laurence wrote:
Wow, interesting that they didn't use SOME kind of substrate to isolate the polyester? They must not have tested their own film? 
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GrahamNR17
Joined: 17 Jan 2009
Posts: 1855
Location: Norfolk, UK
Expire: 2012-09-06
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| Posted: Sun May 03, 2009 8:28 pm Post subject: |
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GrahamNR17 wrote:
That's true. It's the winding and unwinding that creates the problems  |
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Farside
Joined: 01 Sep 2007
Posts: 6549
Location: Ireland
Expire: 2013-12-27
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| Posted: Mon May 04, 2009 12:35 am Post subject: |
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Farside wrote:
Good grief, that totally wrecks a shot. I'm thinking of little anti-static brushes that rub against the film and connect to a grounding rod, running down the photographer's leg. 
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F16SUNSHINE
Joined: 20 Aug 2007
Posts: 5486
Location: Left Coast
Expire: 2011-11-18
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| Posted: Mon May 04, 2009 1:45 am Post subject: |
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F16SUNSHINE wrote:
| Farside wrote: |
| Good grief, that totally wrecks a shot. I'm thinking of little anti-static brushes that rub against the film and connect to a grounding rod, running down the photographer's leg. |
I guess that would be a sort of IS system for film shooters in a way 
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marty
Joined: 09 Apr 2009
Posts: 767
Location: Italy
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| Posted: Mon May 04, 2009 3:46 pm Post subject: |
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marty wrote:
Hi,
I can confirm the problem. In the past I made some Ilfochrome prints before it disappeared from the shelves of my usual seller.
This material has a polyester base and albeit I could not see any effect on the finished print I indeed saw some discharges while inserting the sheets in the developing drum.
Marty. |
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