Real Time - anti-halation
edwenn: Re: light leak / fogging happy accident question
9 March 2012, 8:04 pm
edwenn
Re: light leak / fogging happy accident question - http://www.filmwasters.com/forum...
March 9
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I think I have it figured out, where that aura effect comes from. I knew I had a light leak around the edges because the film holder wasn't set in place properly, and when I lift the dark slide prior to exposure and leave it up for a second after exposure, light was leaking in and fogging the film. It has the characteristic low contrast and more shadow detail of fogged or pre-flashed film. But in all I read there was no mention of this aura or glow. Then I looked up a piece on halation because I realized this must be what was going on. http://chestofbooks.com/arts... Halation is basically the incoming light bouncing around within the emulsion layer, scattering the light. So that must be it. But why did I get that. All film has this
anti-halation coating on the back to absorb the light and prevent reflection and scattering of light. So why did the light leak and fogging lead to halation. Then I read in that link how... - edwenn
edwenn: Re: Anyone using Fomapan?
20 January 2012, 12:33 pm
edwenn
Re: Anyone using Fomapan? - http://www.filmwasters.com/forum...
January 20
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Never used it but I think pre-washing it is probably the best way to go... though it should all come off during the final rinse anyways.
anti-halation dye is what makes up the
anti-halation layer... so they can be considered the same thing (I think) - edwenn
edwenn: Anyone using Fomapan?
20 January 2012, 10:46 am
edwenn
Anyone using Fomapan? - http://www.filmwasters.com/forum...
January 20
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Just tried some and had problems with a green colouring left on the film. I assume it's
anti-halation dye. I thought more fixing would shift it (seems to be the usual advice) but it didn't so I dunked the film back in some developer and that got rid of it (I tried this on the basis the developer came out quite green so I thought it must be removing the dye).
Is this something unique to Fomapan? Is it true the fixer normally removes the
anti-halation dye? Is this the difference between an
anti-halation dye and an
anti-halation layer (or is there no difference)?
Thoughts anyone? - edwenn
edwenn: Re: Developed 1st Roll
3 January 2012, 4:56 am
edwenn
Re: Developed 1st Roll - http://www.filmwasters.com/forum...
January 3
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expired/ oxidised/ weak dilution of developer would only result in either thin negs or clear film.
if there is no image visible at all, just a series of dense black squares, it can only be a problem with over exposure in camera. Maybe due to sticky shutter or a heavy light leak coming through the lens or lens mount.
Tmax films require longer fixing and washing times than most to remove the undeveloped silver and residue anti halation dyes. That's why I avoid the stuff and use Ilford delta or HP/FP films - edwenn
edwenn: Re: Developed 1st Roll
2 January 2012, 2:42 pm
edwenn
Re: Developed 1st Roll - http://www.filmwasters.com/forum...
January 2
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Quote from: Francois on Today at 09:07:28 AM
Quote from: SprayNPray on Today at 04:38:45 AM
the film was a pink transparent color (see through) with some completely black squares.. no images formed. any idea what that could be from?
Check the camera, it sounds like the shutter gets stuck open and grossly overexposes everything.
I don't know if 120 is any different than 35mm when it comes to t-max's
anti-halation layer. I used to pre-rinse the film and never got the pink negatives... though the rinse came out very colorful.
i was using my diana.. i just tested it out now and it works fine.. the only other thing i could think of is that my developer oxidized (i pre made a gallon). it's odd though because i could understand if the whole thing was see through but there are a few black square patches there too. - edwenn
edwenn: Re: Developed 1st Roll
2 January 2012, 10:07 am
edwenn
Re: Developed 1st Roll - http://www.filmwasters.com/forum...
January 2
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Quote from: SprayNPray on Today at 04:38:45 AM
the film was a pink transparent color (see through) with some completely black squares.. no images formed. any idea what that could be from?
Check the camera, it sounds like the shutter gets stuck open and grossly overexposes everything.
I don't know if 120 is any different than 35mm when it comes to t-max's
anti-halation layer. I used to pre-rinse the film and never got the pink negatives... though the rinse came out very colorful. - edwenn
edwenn: Re: Developed 1st Roll
2 January 2012, 7:07 am
edwenn
Re: Developed 1st Roll - http://www.filmwasters.com/forum...
January 2
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The colour is probably just the
anti-halation layer (on the back of the film) that flows out in the dev mix. With some films it's pink, others green or blue. If all your frames are black then ... serious overexposure? Though if your frame edges are crisp at least you have nice flat film at the film gate. - edwenn
tgyhuj17: anti-halation backing
28 December 2011, 6:14 pm
tgyhuj17
anti-halation backing - http://www.kotusozluk.com/t...
December 28
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