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Author Topic: Recipocity failure in digital cameras  (Read 3537 times)

Offline Rik

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Recipocity failure in digital cameras
« on: November 15, 2009, 17:49 »
Has anyone ever come across a reference to this? It was always an issue in film photography with long exposures, but I've never seen it referred to in connection with digital photography.
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Rik

Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #1 on: November 15, 2009, 17:53 »
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Offline Rik

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Re: Recipocity failure in digital cameras
« Reply #2 on: November 15, 2009, 17:59 »
Useful, thanks. I like the idea of cancelling with a blank frame...
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Offline Clive

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Re: Recipocity failure in digital cameras
« Reply #3 on: November 15, 2009, 19:44 »
It was the bane of astrophotographers who wished to take long exposures to capture ever dimmer objects.  A way around it was to  hypersensitize the film by bathing it in hydrogen gas for a few hours.  Best results were obtained with Technical Pan.

Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #4 on: November 15, 2009, 20:41 »
I actually have no idea whatsoever what this thread is about!  :stars: :)x
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Offline Clive

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Re: Recipocity failure in digital cameras
« Reply #5 on: November 15, 2009, 20:46 »
In a nutshell, long exposures cause fogging even in the dark.  :)

Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #6 on: November 15, 2009, 21:44 »
Ah, OK, and digital cameras don't do that.  :)
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Offline Rik

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Re: Recipocity failure in digital cameras
« Reply #7 on: November 16, 2009, 09:17 »
I'd describe it differently. Normally, photographic exposures are linear, eg you double the shutter speed, you open up the lens by a stop. This is only true, though, for a limited range of exposure times, too short (rare) or too long, and the film became less sensitive. Anything much above about 30 seconds required compensation, and there was no easy way to work out how much.
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Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #8 on: November 16, 2009, 09:55 »
But, digitals are immune, yes?
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Offline Rik

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Re: Recipocity failure in digital cameras
« Reply #9 on: November 16, 2009, 10:12 »
Yes, they just get noisy instead, but you can cancel that in a number of ways.
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Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #10 on: November 16, 2009, 10:33 »
Somehow, I don't think it's something I'll need to be concerned about.  :)
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Offline Rik

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Re: Recipocity failure in digital cameras
« Reply #11 on: November 16, 2009, 11:02 »
Only if you get into night shooting.
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Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #12 on: November 16, 2009, 11:48 »
I need go get back into day shooting first.  :)
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Offline Rik

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Re: Recipocity failure in digital cameras
« Reply #13 on: November 16, 2009, 11:48 »
Most people shoot birds.  :o:
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Offline Simon

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Re: Recipocity failure in digital cameras
« Reply #14 on: November 16, 2009, 11:53 »
Only the ones that sht on the windscreen.  But it's just as easy go not go out with them again.  :)x
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