Re: IR FAQ and pinholes (suggestion)

[Don Roberts <droberts@xxxxxxxxxxxxx>]

Clive Warren wrote:

> >To the group,
> >
> >I can see by the recent flurry of posts about the "pinhole" problem that
> >there is a large, residual base of frustration out there.
> >
> >Once again, there are suggestions that reticulation from abrupt temperature
> >changes or over-acidic shortstop might be to blame for the voids in the
> >emulsion. (In this current exchange, no one mentioned dust.) These
> >situations could damage your film, but the results would be gross - large
> >damaged areas - and good darkroom technique will eliminate the problem.
> >
> >The pinholes I find in almost all my 4x5 HSI (even in the film sent to me by
> >Kodak) are created in the emulsion coating process by minute particles in
> >the anti-halation layer migrating into the image forming layer. This
> >explanation was offered to me by Steve Hedges at Kodak in a conversation on
> >8/10/98. I have since spoken with and written to Dick Johnson,  Kodak Dept
> >MTS, about the problem. In November '98, I sent Johnson a packet of Email
> >messages and posts from this group with complaints about pinholes. He
> >eventually told me he hoped Kodak would solve the problem "by the end of the
> >year" ('99).
> >
> >I am really upset that Kodak makes a defective productÖ but consider the
> >alternatives. These Kodak guys are sympathetic and would like the production
> >line to be changed. But, there is the dark suggestion that if it is too
> >costly to fix, Kodak could drop the film. Is this just an intimidating
> >bluff?
> >
> >In any case, I will compile a few recent posts into another letter to Dick
> >Johnson and ask him how it is going.
> >
> >Stan Patz   NYC
> >
>
> >
> >In my earlier post, I made a misstatement. HSI and HIE do not have
> >anti-halation coatings. The pinholes, according to Steve Hedges, are due to
> >migrating particles from an anti-static layer.
> >
> >My apologies for any confusion.
> >
> >Stan Patz  NYC
> >
> >
>
> Hello Stan,
>
> Have read with interest your previous posts about HSI and HIE pinholes.
> Thanks for the update.
>
> Please can I have your permission to include the contents of your postings
> in the most recent version of the IR FAQ which I am rewriting?  I will of
> course credit your contribution and provide a link back to you via EMail
> and your web site if you have one.
>
> Look forward to hearing from you,
>
> Please copy your reply to irfaq@xxxxxxxxxxx, thank you.
>
> All the best,
>
>              Clive   http://www.cocam.co.uk
>                      Photographic Services, Filters and Equipment
>                             http://clive.bel-epa.com
>                             Adventures in Cyberspace - Digital Art and Photos
>

Considering how often the pinhole question arises maybe we should put a
statement in the list signature box to pre-empt further rehashes of the
subject.  It seems all new people eventually run into pinholes and perhaps the
answer in the FAQ should be emphasized up front.


--
=========================================================
     Don Roberts -Bittersweet Productions - Iowa City, Iowa

*                                              *
"Sometimes I think we're alone. Sometimes I think we're not.
 In either case, the thought is staggering."  - Buckminster Fuller
==========================================================


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