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Reciprocity times....

pikey 14 861
3 May 2006 12:43PM
Hi Folks...

Had a bit of a hunt around with not much luck...Can anyone point me in the direction of a reasonably definative list of reciprocity times for various film types...

Also..., I am after some technique info for calculating long exposures. Anyone know of any info I can lay my hands on ?

Thanks if you can help....

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3 May 2006 1:27PM
You will find this sort of information in the manufacturer's technical literature - I have one example in front of me now "Kodak Professional Black and White Films". This gives the information you need for the appropriate films, and there will be similar Professional publications from Fuji.

Alternatively, check out the data areas of the relevant manufacturers' websites.

Big Bri 16 16.3k United Kingdom
3 May 2006 2:16PM
Any film in particular ? I have a data guide for fuji films (couple of years old now) (actually I just checked and its from 2001) which has all the info you could ever need for fuji films.
pikey 14 861
3 May 2006 2:36PM
It was fuji I was after, Bri...their provia 100.

I seem to be getting a bit of conflicting info. I have read that there is no adjustment required up to 128 secs...Just seems a bit odd that and contradictory to my general rule of thumb. Either that or emulsion technology has moved on a bit since I last shot film !
Big Bri 16 16.3k United Kingdom
3 May 2006 3:09PM
Provia 100F:

1/4000 sec to 128 sec - None

4 min - 2.5G + 1/3 stop

8 min - Not recommended

Hope that helps.
pikey 14 861
3 May 2006 3:29PM
It's late...

2.5 G ??

I'll let you answer that tomorrow ; )

Thanks, Bri and g'night....
Big Bri 16 16.3k United Kingdom
3 May 2006 11:11PM
I believe 2.5G is the colour correction filter you should use for a 4 minute exposure (reciprocity failure affects the exposure, but also the colour). Sorry I don't have more detail - I'm at work now and I left the data guide at home.
pikey 14 861
3 May 2006 11:37PM
Thankyou Bri...
Big Bri 16 16.3k United Kingdom
3 May 2006 11:46PM
You're welcome. Swap you my supply of film for your 1DsMkII ?????

pikey 14 861
4 May 2006 12:37AM
You'd have to have a hell of alot of film ; )
FrankThomas 15 2.8k United Kingdom
4 May 2006 1:25AM

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