[pure-silver] Re: [OT] Filmholders, Septums, Total-Disasters

  • From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
  • To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
  • Date: Wed, 23 Nov 2005 17:22:34 +0100

Vacuum holders are available to overcome this problem. They are expensive
but effective. Schneider or Rodenstock (I forgot) presented them at
Photokina 2000. The difference was impressive.





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com







On 2005-11-23 17:03, "Eric Nelson" <emanmb@xxxxxxxxx> wrote:

> I've seen photogs use a small square piece of double
> stick tape in the center of their 8x10 holders and
> esp. for 11x14.  This was because the larger film
> could bow esp. in changing temps and humidity and the
> fact it's a large piece of acetate that one wants to
> be as flat as possible.
> Eric Nelson
> http://www.archival-photo.net/
> http://www.eman-photo.com/
> 
> --- Michael Healy <emjayhealy@xxxxxxxxxxxxx> wrote:
> 
>> So I'm trolling for a darkslide replacement the
>> other day, and the house guru of the LF
>> department says, "Ho jees, not a Riteway, I
>> absolutely refuse to carry those." Awhile
>> back, he says, he sat down with his buddy (who
>> happens to be one of the big-time LF
>> camera makers, and happens to live-work-manufacture
>> in this neck of the woods). They
>> made  measurements, and every one of fhe film
>> holders they measured, every one, had
>> the septum ever so much off center. I think he told
>> me that the Riteways are the worst
>> culprits, but Liscos and Fidelities didn't escape
>> him either. Very little tolerance for the
>> placement of that septum, you know, and all these
>> manufacturers are cranking out
>> shoddy septums. He had one guy who could never get
>> pictures in focus. First he
>> replaced his camera. (This is a sales guy
>> talking...) Next all the lenses. Finally there was
>> only one thing it could be: those holders. And that,
>> presumably thousands of dollars
>> later, probably spent in this sales guy's shop, THAT
>> turned out to be the problem!
>> 
>> He isn't finshed yet. The real problem, he says, is
>> that you can't always even tell. It won't
>> be the whole image that's out of focus. It'll be out
>> of focus here or there only. So here's
>> what I gotta do: I gotta throw away my two dozen 4x5
>> Liscos and Fidelities, and of
>> coursre those Riteways, too, those things belong in
>> hell's Nineth Circle. Throw out every
>> one of them and get myself a bunch of Toyo holders.
>> And mirabile dictu! He just
>> happens to stock those. (He didn't say what I'm
>> supposed to do about my pre-WWII
>> 8x10 holders. Those seem to be working fine, too,
>> but who we gonna believe, my lying
>> eyes?)
>> 
>> I've been needing to get myself a feeler gauge
>> anyhow, because I need to check a
>> couple of my spark plugs. So when I do, I'm going to
>> check all of mine just to spite this
>> guy. Trouble is, I have never, but never, heard of
>> any rampant problem with maladjusted
>> septums. Nor have I ever experienced any noticable
>> problems with spotty focus. Well,
>> none at least that I wouldn't attribute to a
>> maladjusted back standard or maybe a
>> maladjusted lensboard.
>> 
>> Is there legitimacy to this guy's claim? Have I been
>> ignorant all these years about
>> something known to everybody else? Are all of my
>> images secretly out of focus?
>> 
>> Mike Healy
> 
> 
> 
> 
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