- Original Message -
From: "James Noel"
> What a complicated answer.
> Simply put, most film is designed to react to light in a linear fashion
> from about 1/2 second to 1/1000 second.
Thanks James, I knew somebody would have a way to explain it in an easier way
than me, even if technica
Also want to add to Guillermo's excellent exposition, reciprocity
faiulure affects color, if you are working in color,and different films
have different color shifts. About the 20 foot tube -what is the plan?
Is the film going to be at the end of the tube or wrapped around inside
it's circumferenc
What a complicated answer.
Simply put, most film is designed to react to light in a linear fashion
from about 1/2 second to 1/1000 second. If times slower or faster than this
are used, the light is not recorded in the same linear fashion. Therefore
an adjustment in time is necessary.
If you wan
The table that I have used for most of my 100 iso film is published in
Eric Renners book, Pinhole Photography: Rediscovering a Historic
Technique. I don't have it in front of me, and can't remember off the
top of my head. As soon as I find it I'll let you know.
James
On Wednesday, July 17, 2
James,
Have you got any reciprocity tables for these Fuji films to share with us ?
Ricardo
- Original Message -
From: "James Kellar"
To:
Sent: Monday, July 15, 2002 8:52 PM
Subject: Re: [pinhole-discussion] reciprocity table for ectachrome E100S
> I'm not sure abo
I'm not sure about Ektacrome E100S, but I do know about Fuji Velvia, and
Provia. I have used it on quite a bit with pinhole and and there has
been little or no color shift, even with exposers up to several
minutes. Give them a try.
james
On Monday, July 15, 2002, at 04:05 PM, William Ericks
I tried fitfully to locate a reciprocity failure table for Ectachrome E100S
on the web, without succes. Because I have such miserable results with
Portra color shifts I want to try transparency film for the first time. Can
someone please point me to a reciprocity failure table for this film. thanks
- Original Message -
From: "D Hill"
>
> Amen Leonard! You're the king!
King of the Hill :-)
Amen Leonard! You're the king!
Don
Leonard Peterson wrote: I know, from working years in a
camera store and teaching photography
classes, the following: Lots and lots of picture takers talk and talk
techniques to death and never making any prints. The only way to find
something out is to
I know, from working years in a camera store and teaching photography
classes, the following: Lots and lots of picture takers talk and talk
techniques to death and never making any prints. The only way to find
something out is to TRY IT! In regards to reciprocity failure and
development times
George
This is not an actual increase in development at all this is actually washing
out
the developer in the highlights and allowing the shadow values to develop very
very slowly. This slow development actually brings full detail to the shadow
areas and the highlight areas do not overdevelop.
Jay -
If reciprocity failure has caused an underexposure of the scene, then
increasing the development is simply going to increase the contrast of the
scene. If shadow values have not received enough exposure, then no amount of
developing is going to bring them back.
Cheers -
george
--- b1jm
--- "gregg b. mc neill" wrote:
[clip]
> The whole thing about overexpose and under develop, or underexpose to over
> develop never made sense to me as the conditions under which I shoot could
> change mid-roll.
>
> gregg mcneill
Actually, this has more to do with working with sheet film, as o
eet film so I do pay attention to exposure vs development for each
exposure, but as it turns out, it's unnecessary to make additional
corrections with HP5+ in development times for long exposures.
--shannon
--
>From: "gregg b. mc neill"
>To: pinhole-discussion@p
Hello Shannon,
For longer exposures I always use a water / developer technique. I expose
my film normally and figure any reciprocity law failure as need and factor
that into my development time like usual. I ususally use this process when
I shoot at night but it also works for long exposures dur
I, too have been noodling this. I've had sucess with taking care of all of
the reciprocity corrections at the time of exposure. I process normal.
The whole thing about overexpose and under develop, or underexpose to over
develop never made sense to me as the conditions under which I shoot cou
Sorry to have a one track mind, but I am still thinking about whether you
need to change your development times when you make long exposures. The
theory seems to be that highlights expose more than shadows during long
exposures, so that you should under-develop. But, when I do this the
highlights
I came across something on the internet today about reciprocity failure,
specifically about HP5+. It said that to calculate RF, all you have to do
is raise the metered time to the 1.48 power. The formula was Ec=Em^1.48,
where Ec is the corrected time and Em is the metered time. Is it really
tha
Guillermo,
Your persistence is admirable.
Yes TMY does need very much less compensation than my usual HP5+ as I found
out in trying to print bullet-proof 120mm film negs. I had to develop for
the general exposures on the roll and not the 300sec. exposures done inside
an almost completely darken
Allow me just 1 more try, pls:
corrected
time
| (100,300) >P
| _
|_
| _
| _
|
Told you they were axis of evil, can't get the chart to format correctly, here
is the last try:
corrected
time
| (100,300) >P
| _
|
** Resending the message, hopefully the ascii chart won't break up this
time.
- Original Message -
From: "I Zarkov"
> Unfortunately the Kodak product search engine gives nothing for the topic
> of 'reciprocity'which is too bad because they once had a very good chart
> in an old profess
- Original Message -
From: "I Zarkov"
> Unfortunately the Kodak product search engine gives nothing for the topic
of
> 'reciprocity'which is too bad because they once had a very good chart in
an
> old professional products catalogue that gave a good long and short range
> adjustments for
Ingo,
Here is a link to the Ilford pdf:
http://www.ilford.com/html/us_english/pdf/HP5_Plus.pdf
which has a small reciprocity chart. For the general Kodak link to their
various films:
http://www.kodak.com/global/en/professional/support/techPubs/f32/f32.pdf
Unfortunately the Kodak product sear
Dear 'Z',
I want to try HP5+ sheet film and need the chart for conversation. Please
share it for me.
Regards
Ingo
- Original Message -
From: "I Zarkov"
To:
Sent: Monday, February 25, 2002 6:25 PM
Subject: [pinhole-discussion] reciprocity and TMY film
> Dear List,
Guillermo,
Thanks for the times. I'll give them a try.
Zarkov
_
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.
Try this values:
Indicated,Corrected
10,15
12,21
15,27
20,35
25,47
30,62
40,1:24
50,1:50
60,2:25
80,3:10
100,4:10
Guillermo
Dear List,
Folllowing on recent discussion on Polaroids and reciprocity:
I have receently changed from Ilford HP5+ to TMax 400 4x5 sheet film in my
home made 'soup can and film box' pinhole cameras. HP5+ has a pretty well
defined chart for conversion from indicated to adjusted exposure times but
half
hour exposure, not much before that.
- Original Message -
From: "Guy Glorieux"
To: "Pinhole List"
Sent: Sunday, December 16, 2001 1:43 AM
Subject: [pinhole-discussion] Reciprocity failure with paper
> Hi everyone,
>
> Does anyone have information about
Hi everyone,
Does anyone have information about reciprocity failure with paper. I
have to print large format prints which require long exposures (several
minutes) and can't open the lens without creating vignetting on teh
edges of the print.
It would help if I could know more about the appropria
Thanks. I think Zen is the proper approach to very long exposures. The gods
seem to know.
- Original Message -
From:
To:
Sent: Sunday, December 02, 2001 5:59 PM
Subject: Re: [pinhole-discussion] reciprocity failure of paper negs.
> Bill,
> I don't know if I can give you spe
Bill,
I don't know if I can give you specifics, but my longest successful exposure
has been 47 days. I tried an exposure in a basement area for ten days and the
result was too faint so i put the date I began the next exposure and kind of
forgot about my camera for a while. When I remembered it,
ay.org/2001/photo_63.html
:)
Gregg
- Original Message -
From: Guy Glorieux
To: pinhole-discussion@p at ???
Sent: Thursday, November 29, 2001 6:47 AM
Subject: Re: [pinhole-discussion] reciprocity failure of paper negs.
Bill Erickson wrote:
I'm planning an image of a dark
I get the message. More is better, but don't forget to go to bed.
- Original Message -
From: Guy Glorieux
To: pinhole-discussion@p at ???
Sent: Thursday, November 29, 2001 6:47 AM
Subject: Re: [pinhole-discussion] reciprocity failure of paper negs.
Bill Eri
" reciprocity nightmare ' great stuff , thank you...regards mickey
a happy life is made up of many happy moments
Bill Erickson wrote:
> I'm planning an image of a dark corner in an old building. The
> exposure calculates out to about five days with a paper negative. At
> what exposure time does one begin to run into reciprocity failure with
> paper, and what are the parameters?
Bill,
I wrote a little pie
I'm planning an image of a dark corner in an old building. The exposure
calculates out to about five days with a paper negative. At what exposure time
does one begin to run into reciprocity failure with paper, and what are the
parameters?
400. The reciprocity failure for 400
is worse than 100. You really can't get much of an equation from three
points.
Hope this helps,
John Yeo
> - Forwarded message --
> From: Ballard Borich
> To: pinhole-discussion@p at ???
> Date: Thu, 21 Jun 2001 10:2
-
From: Jeff Dilcher
Sent: Tue, Jun 19, 2001 9:03am
To:
Subject: [pinhole-discussion] Reciprocity Problem
*** Warning ***
*** Technical Question Follows **
** press delete key if technical questions bother you **
I have a technical question, that, perhaps someone on
the list can help me with
- Original Message -
From: "G.Penate"
> Don't think so, if you download Regression Analyzer
> http://www.zdnet.com/downloads/stories/info/0,,000QE3,.html you just need
to
> input any pair of values of KNOWN reciprocity corrections (Y axis)
> corresponding to METERED values (X axis), sele
> I would like to enter in a meter reading, and have it give methe number of
> seconds (or minutes) for the exposure with all filter factors and
> reciprocity factors adjusted in. Factoring filters is easy, but I am hung
> up on reciprocity.
If you don't "eyeball" your exposures, which I could be
Before I bore alot of people with techno babble, let me
invite folks to see some scans that I have done over the last year
or so:
http://hiddenworld.net/pinhole
Thanks to the several people who responded to my reciprocity
problem. I have not had good results, especially in low
light conditions
9, 2001 8:03 AM
Subject: [pinhole-discussion] Reciprocity Problem
>
>
> *** Warning ***
> *** Technical Question Follows **
> ** press delete key if technical questions bother you **
>
>
> I have a technical question, that, perhaps someone on
> the list can help me with. Pl
Hi Jeff,
www.curvefit.com goes into a bit of detail if you're interested in the math
- or maybe try a google search on linear regression and non-linear
regression.
Otherwise, I have a bit of mathematical ability and if you provide me with
your data I could construct an equation for a curve.
> *** Warning ***
> *** Technical Answer Follows **
> ** press delete key if technical questions bother you **
- Original Message -
From: "Jeff Dilcher"
> I am trying to develop a mathematical function which will
> help determine reciprocity compensations.
As MS says, that is a good thi
*** Warning ***
*** Technical Question Follows **
** press delete key if technical questions bother you **
I have a technical question, that, perhaps someone on
the list can help me with. Please respond
directly if you like.
I am trying to develop a mathematical function which will
help determ
"The New Moon was further darkened by an incredibly rare simultaneous
eclipse of the sun and the moon."
We get cabin fever this time of year, too! :-) Jim
, January 11, 2001 4:14 AM
To: pinhole-discussion@p at ???
Subject: Re: [pinhole-discussion] Reciprocity nightmare
Guy,
Excellent !!! (en français dans le texte...)
"Pourquoi faire simple quand on peut faire compliqué ?"
"Why do it simple when you can do it complicated ?"
nhole List"
Sent: Wednesday, January 10, 2001 9:17 AM
Subject: [pinhole-discussion] Reciprocity nightmare
> I had a dream...
>
> It was a dark, lonely night and I was out with my 8x10 PH camera. The
> New Moon was further darkened by an incredibly rare simultaneous eclipse
> of
Thanks leezy,
Guy
From:
>
> No...he's not a member of the list but I just sent it to him with your
> permission.
> Best,
> leezy
>
In a message dated 1/10/01 3:18:43 PM, guy.glori...@sympatico.ca writes:
<< I'd be happy to contribute this piece to the Pinhole Journal but I wouldn't
know how to contact Eric. Is he a member of the list? >>
No...he's not a member of the list but I just sent it to him with your
permission.
Bes
b2myo...@aol.com wrote:
> Guy,
>
> Thank you.
> This piece is very funny, nice light hearted touch.
>
> Perhaps Eric Renner would like to see it...perhaps for the Pinhole Journal.
>
> leezy
>
Hi leezy,
I'd be happy to contribute this piece to the Pinhole Journal but I would'nt
know how to conta
bravo!!!
a happy life is made up of many happy moments
Dear Mr Glorieux,
I am writing to congratulate you on winning top prize at the First
International Nocturne Pinhole Exhibition, in the dream reciprocity category...
:-) Gregg
_
Pinhole Visions at http://www.p at ???
Great fun, Guy! Hope your next dream gets here soon.
Jim K
- Original Message -
From: "Guy Glorieux"
> I had a dream...
>
> It was a dark, lonely night and I was out with my 8x10 PH camera. The
> New Moon was further darkened by an incredibly rare simultaneous eclipse
> of the sun and
Guy,
Thank you.
This piece is very funny, nice light hearted touch.
Perhaps Eric Renner would like to see it...perhaps for the Pinhole Journal.
leezy
I had a dream...
It was a dark, lonely night and I was out with my 8x10 PH camera. The
New Moon was further darkened by an incredibly rare simultaneous eclipse
of the sun and the moon. I could barely see my hands and feet as I
walked to the scene I was about to shoot for that winning picture for
I've been doing some multiple hour exposures on kodak polymax paper and I
got to wondering at what length of exposure with a paper negative do you
need to begin to factor in reciprocity failure. My results suggest that the
answer may be around 1 hour. Any ideas?
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