RE: Flashing before or after exposure...

George,
You do not need a densitometer; you can use an exposure meter, as out lined
in a book I got out from the library[some time ago]. Admittedly this was for
negatives using an enlarger if you are interested will get details, and mail
them to you
Cheers
Eric M

-----Original Message-----
From: owner-pinhole-discussion@spitbite.org
[mailto:owner-pinhole-discussion@spitbite.org] On Behalf Of George L Smyth
Sent: 17 November 2004 14:27
To: pinhole-discussion@spitbite.org
Subject: RE: [pinhole-discussion] Flashing before or after exposure...

As I see it, it is additive no matter which way you go. I would imagine
that an exposure could decrease the threshold in certain areas, then a post
flashing could trigger these grain clusters. Testing is the only way to
know for sure, but since I do not have a densitometer I would need to yield
this to someone with the proper equipment. I am going to guess that one
will not be able to tell the difference through observation, just as I am
not able to tell the difference between a "perfect" pinhole and one that is
slightly too large or small.

When I get a chance I will see if the above is correct. I have a decent
supply of Panalure and will be testing some of this anyway.

Cheers -

george

-----
http://www.GLSmyth.com
http://DRiPInvesting.org

 --- On Wed 11/17, Loris Medici < loris_medici@mynet.com > wrote:
From: Loris Medici [mailto: loris_medici@mynet.com]
To: pinhole-discussion@spitbite.org
Date: Wed, 17 Nov 2004 15:45:48 +0200
Subject: [pinhole-discussion] Flashing before or after exposure...

My understanding is:<br><br>Pre-exposure will decrease the treshold of
silver grains; that way they<br>are more easily triggered in exposure so
they're able to form an image<br>later in the development stage.
Post-exposure will only intensify<br>already triggered grains, will not
affect the non-triggered grains<br>(because the treshold was high at the
time of real exposure). Therefore,<br>results of pre or post flashing should
be different.<br><br>What do you think?<br><br>Loris.<br><br>> -----Original
Message-----<br>> From: owner-pinhole-discussion@spitbite.org <br>>
[mailto:owner-pinhole-discussion@spitbite.org] On Behalf Of <br>> Earl and
Patty Johnson<br>> Sent: Wednesday, November 17, 2004 2:30 PM<br>> To:
pinhole-discussion@spitbite.org<br>> Subject: Re[2]: [pinhole-discussion]
Re: <br>> pinhole-discussion-digest V1 #179<br>> <br>> <br>> ... I agree
with George that <br>> post-exposure flashing should yield the same result
as <br>> pre-exposure flashing.<br>> ...<br><br!
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Received on Wed Nov 17 09:06:13 2004