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Extended exposures
Posted: Fri Jan 23, 2009 1:31 pm
by Nivek
Hiya all.
Does anyone know where I can download an extended exposure chart I can print off to put in my camera bag.
I’m particularly interested in the times over 30 secs and reciprocity failure.
I will be taking exposures of over 30 mins.
Can anyone help?
Kevin.
Re: Extended exposures
Posted: Fri Jan 23, 2009 1:57 pm
by miha
Nivek wrote:Hiya all.
Does anyone know where I can download an extended exposure chart I can print off to put in my camera bag.
I’m particularly interested in the times over 30 secs and reciprocity failure.
I will be taking exposures of over 30 mins.
Can anyone help?
Kevin.
There is no sigle chart. Each film has it`s own reciprocity failure. Check the tech data at Kodak:
http://www.kodak.com/global/en/professi ... ndex.jhtml , Fuji:
http://www.fujifilm.co.uk/film/film.html , and Ilford:
http://www.ilfordphoto.com/products/pro ... onal+Films
Posted: Sun Jan 25, 2009 10:42 am
by pentaxpete
One 'reciprocity failure' effect you might experience with LONG time is an increase in contrast on negative materials-it is the opposite to the effect of very SHORT times such as fast flash where the negatives need extra development to combat lower contrast.