[Tig] ND filters for projections

Susiluoto Jarni Jarni.Susiluoto at kava.fi
Wed Oct 16 05:15:12 BST 2013


Do anyone have any experience about Lee Filters? Largest ones 150x150mm


I don't have any connection with Lee Filters Co. But we have problem to reduce light output easily - ie without need to change Xenon or Iris Plate -  when screening 2D and still getting deasant output with 3D.

Jarni Susiluoto

Colorist, National Audiovisual Archive,  Finland

-----Alkuperäinen viesti-----
Lähettäjä: Tig [mailto:tig-bounces at colorist.org] Puolesta Graham Collett
Lähetetty: 15. lokakuuta 2013 17:58
Vastaanottaja: Juan Salvo; Robert Houllahan
Kopio: tig at colorist.org InternetGroup
Aihe: Re: [Tig] ND filters for projections

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i would imagine that you would have to get the filter as far from the focal plane as p[ossible to reduce those uniformity errors. So maybe a larger filter further from the lens might work better.
Graham Collett
From: Juan Salvo <js at grsv.com>
Sent: 08 October 2013 19:48
To: Robert Houllahan
Cc: tig at colorist.org InternetGroup
Subject: Re: [Tig] ND filters for projections

Hi Rob,

Thanks for the advice.

I've actually tried the Tiffen as we had a set around. Saw major uniformity issues, which was what prompted me to ask the TIG. :)  I'm now testing other brand with somewhat better results. Will update you once I've evaluated more thoroughly.

Thanks guys.

On Tue, Oct 8, 2013 at 12:15 AM, Robert Houllahan <rob at cinelab.com> wrote:

> > Do any of you have any insights on what brand/types of NDs work 
> > best? The ones I've tested seem to exhibit some troubling uniformity issues.
> >
> > I'm looking for a 1/3-2/3 of a stop reduction. So a .1 or .2.
> >
> > Any advice would be appreciated.
> A Tiffen 4x4 or 4x5.65 should be uniform enough I would think? What ND 
> did you try?
> -Rob-
> Robert Houllahan
> VP - Colorist
> HD-2K-3K-4K Data Scans
> 8mm-16mm-35mm Lab
> www.cinelab.com<http://www.cinelab.com>
> rob at cinelab.com


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