[Tig] ND filters for projections
grahamcollett at visible-sprockets.co.uk
Wed Oct 16 08:53:51 BST 2013
i dont, but they have a good name in production circles i believe.
I have usually used tiffen or an equivalent "format filters"
I'm surprised tiffen have uniformity issues. If you rotate/flip the filter, does the uniformity error go with the filter ? or are you seeing an exaggerated lamp/lens error.
From: Susiluoto Jarni <Jarni.Susiluoto at kava.fi>
Sent: 16 October 2013 05:15
To: Graham Collett; Juan Salvo; Robert Houllahan
Cc: tig at colorist.org
Subject: VS: [Tig] ND filters for projections
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.
Colorist, National Audiovisual Archive, Finland
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
Sohonet www.sohonet.co.uk sponsors the TIG.
Support from Digital Vision www.digitalvision.tv Support from MediaCloud www.MediaCloud.cc =====
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.
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
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.
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?
> Robert Houllahan
> VP - Colorist
> HD-2K-3K-4K Data Scans
> 8mm-16mm-35mm Lab
> rob at cinelab.com
More information about the Tig