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problems with 85 filter


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#1 jeroenvanderpoel

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Posted 21 July 2008 - 03:42 PM

Hey, i wanted to share the next problem with you guys;
i ve bought a second hand ceneiplan r 12 2* filter.

The owner of the filter told me that it must be a 85 filter.
ive just found a article about filters, and it seems to be, that the r 12 2* filter is the same
as a 85 kodak wratten series.
Because i plan to work with this filter i wanted to know what exposure rate should be the good one.
Im working with ektachrome 64t so with a filter attached to the lens the exposure rating should be 40 asa;regarding the kodak site.
After i did a spot measuring through the filter and rated it at 64 asa, i did the same measuring on the same spot without the filter, my meter told me that 25 asa should be the equivalent.
So iam very confused right now, because maybe i do the wrong thing.
Can somebody tell me how to rate the exposure with this filter attached to my lens.

greets Jeroen van der Poel
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#2 Adrian Sierkowski

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Posted 21 July 2008 - 03:44 PM

I'm not familiar with that filter designation, but it could be an equivalent of an 85N.3, which would take away 1 stop of light (e.g. making a 40asa 25asa)
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#3 jeroenvanderpoel

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Posted 21 July 2008 - 04:04 PM

Anyway thanks, but of cours i want to be sure; because film is a expensive thing.
And we already did our test films on several stocks, so we really have to begin filming for real...

here is the link showing comparable filter stocks;

http://photobutmore....iltervergleich/

I did the spot metering again and again but it showed the 25 asa rating again and again (ektachrome 64 asa rating)

it should be great if there is somebody out here familiair with the ceneiplan r12 2* filter.
Does somebody know how to explain de '2*' thing int filter code?

greets

Jeroen van der Poel
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#4 Tim Terner

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Posted 21 July 2008 - 04:57 PM

Normal Loss is 2/3 of a stop with an 85. You have 1 and a 1/3, so that x2 on the filter must be a ND.3 - Adrian is correct
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#5 jeroenvanderpoel

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Posted 21 July 2008 - 05:11 PM

Normal Loss is 2/3 of a stop with an 85. You have 1 and a 1/3, so that x2 on the filter must be a ND.3 - Adrian is correct

Thanx adrian and Tim, its always great to get a confirmation from you guys.
i will post some footage as soon as possible.
Because we have a build in filter (wratten 85), and now a external filter with nd added to it, we can shoose for every light situation, what filter to use.
So i dont have to buy a nd, and thats great news.

peace

let film live forever
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#6 Adrian Sierkowski

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Posted 21 July 2008 - 05:12 PM

And to think my guidance counselor said I'd never amount to anything. . .
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