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  #31  
Old 29th August 2013, 01:58 PM
Mark Snowdon Mark Snowdon is offline
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Have a look at:-

www.seeinglight.com/reciprocity

It gives an extract from Bruce B's book on the subject of reciprocity failue and contrast.

Mark
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  #32  
Old 30th August 2013, 02:42 PM
MikeHeller MikeHeller is offline
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I have just received a copy of this book ordered as a result of this thread. I look forward to reading it especially with the discussion that has been engendered. First look is favourable.
Mike
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  #33  
Old 30th August 2013, 03:44 PM
alexmuir alexmuir is offline
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I've bought a lens hood for my Soligor spot as a result. Haven't tried it yet. Alex
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  #34  
Old 30th August 2013, 09:58 PM
Mike O'Pray Mike O'Pray is offline
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From Mark's link it is clear that Bruce Barnbaum produces a table that shows a correlation between the amount of reciprocity failure and the increase in contrast.

I presume this is based on verifiable tests. Unfortunately the link doesn't include the "theory" that explains how this happens. It would seem that reciprocity failure rather than just a long exposure is key and I am curious as to what reciprocity failure actually does to increase contrast.

Maybe those with the book will be able to educate us.

This is becoming a very interesting thread.

Mike
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  #35  
Old 30th August 2013, 10:05 PM
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My understanding, Mike, is that the extra exposure necessary to overcome reciprocity failure disproportionately affects the highlights. Being near the toe of the film, the deeper shadows are barely affected by the extra exposure but the midtones and highlights build density quite readily. I suppose the end result is like giving an N+1 development to a film.


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