[Tig] PEC limiting MK3

woz warrenl at gmail.com
Wed Mar 5 21:19:07 GMT 2008

Shame on me I should have replied much earlier since it was my question.
I was looking through my mails when I realised I hadn't replied!

It turned out to be the blue head amp, the main active component of which is
a low noise op- amp. Unfortunately I too was convinced it was the PEC.
Levels were fine, it was the inability to slew which caused the problem. It
just couldn't work with that amount of light and hence current quickly
Shading is now tolerable but it's still impossible to get black and white
coincidentally good.

Thanks to all for your input.
woz (ITV/Granada/3Sixtymedia)

On 31/01/2008, Rob Lingelbach <rob at colorist.org> wrote:
> Thanks to Cinelab, Bill Topazio and CO3 for support
> http://www.colorist.org/wiki3
>   ====
> that's right, it was green, not blue.  wonder if anyone's done a
> study of color memory, like, can we remember a particular color's
> properties over a long period of time, and by what other factors is
> this memory influenced.
> On Jan 31, 2008, at 4:49 PM, Graham Collett wrote:
> > the only official filter for the optics of an Ursa was a Kodak made
> > "shading filter" that was made because some films polarised the
> > light going through them and that ended up as a green magenta tilt.
> > If you cant get the filter then you can do a manual shading
> > offset ..but you'll have to keep doing it different as different
> > film react in different ways.
> > regards
> > Graham Collett
> >
> > At one point there was a filter installed by Bill Hogan in LA (the
> > providence of which I don't recall) that improved Ursa shading in the
> > blue PEC significantly. Before filter, impossible to get flat blue
> >
> --
> Rob Lingelbach
> rob at colorist.org   http://www.colorist.org
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