The Reciprocity Index

Mr_T

Mr_T

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I don't believe I've seen another one of these on here but I could always be wrong. The idea behind this thread is for people to discuss the reciprocity characteristics of different films and how we would all personally rate them. To start off I will use the guidelines given out be the manufacturers but I know there are quite a few long exposure nuts who will have different opinions.


Fuji Velvia 50
Up to 1 second - No exposure compensation required
From 4 seconds - +1/3 and 5M colour compensation filter
From 8 seconds - +1/2 and 7.5M colour compensation filter
From 16 seconds - +2/3 and 10M colour compensation filter
From 32 seconds - +1 and 12.5M colour compensation filter
Above 32 seconds - not recommended

Fuji Velvia 100
Up to 1 minute - No exposure compensation required
From 2 minutes - +1/3 and 2.5M colour compensation filter
From 4 minutes - +1/2 and 2.5M colour compensation filter
From 8 minutes - +2/3 and 2.5M colour compensation filter

Fuji Velvia 100F
Up to 1 minute - No exposure compensation required
From 2 minutes - +1/3 and 2.5B colour compensation filter
From 4 minutes - +1/2 and 2.5B colour compensation filter
From 8 minutes - +2/3 and 2.5B colour compensation filter

Fuji Provia 100F
Up to 128 seconds - No exposure compensation required
From 4 minutes - +1/3 and 2.5G colour compensation filter
8 minutes or above not recommended

Fuji Superia 400
Up to 2 seconds - No exposure compensation required
From 4 seconds - +1/3
From 16 seconds - +2/3
From 64 seconds - + 1

Fuji Pro 160s
Up to 2 seconds - No exposure compensation required
From 4 seconds - +1/3

Fuji Pro 160c
Up to 2 seconds - No exposure compensation required
From 4 seconds - +1/3
From 32 seconds - +1

Fuji Neopan Acros 100
Up to 2 minutes - No exposure compensation required
From 2 minutes - +1/2

Kodak E100VS
Up to 10 seconds - No exposure compensation required
Couldn't find more information

Kodak E100G
Up to 10 seconds - No exposure compensation required
From 2 minutes CC10R colour compensation filter

Kodak Portra NC/VC 160/400
Up to 1 second - No exposure compensation required
Longer than 1 second "make tests under your conditions"

Kodak Ektar 100
Up to 1 second - No exposure compensation required
Longer than 1 second "make tests under your conditions"

Unfortunately Kodak aren't nearly so kind with the information they give out, it's probably a bit silly to continue with their black and white line :(. Any input would be much appreciated, hopefully I haven't copied the information down wrong!
 
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BTW for Velvia 50, its up to and not past 32 seconds. However with a 50 minute exposure at f4 you can get some great star trail pictures with Velvia 50, perhaps not the most accurate colours but still great.
 
hmm, does that mean the trails slowly shift in colour throughout the exposure? That could be very cool...
 
I'll post the only one I have at some time when I get it scanned in, the colours don't shift too much as theres not too much movement in the first 4 - 32 seconds but if you magnified it enough I think you would be able to see the difference.

I do have some more somewhere else but I don't have a clue where they are.

If you do want very very saturated colours with Velvia 50 rate it half a stop over at 80 but be warned it is very satuarted. For a bit less saturated, more natural colours colours rate it at 50 or even 32.
 
I have the data sheets for most of the Ilford stuff if anyone's interested - all on PDF...
Can you attach PDFs to PMs...?

apparently not: anyone interested, PM me you email address and I'll send them over...

100 Delta
400 Delta
3200 Delta
FP4
Portra 400
SFX 200
T-Max
XP2-S

ID-11, Perceptol and Microphen
Kodak Exposure Guide
 
which reminds me, i have a Ilford handbook, from early 70s, which has the data for all Ilford chemicals till then...If anyone needs anything let me know
 
s162216 said:
BTW for Velvia 50, its up to and not past 32 seconds. However with a 50 minute exposure at f4 you can get some great star trail pictures with Velvia 50, perhaps not the most accurate colours but still great.
Click to expand...

Are you sure that isn't the old Velvia 50? They stopped making it but due to the exceptional demand they reintroduced it with "improvements". Unlike the old film apparently does appear to be a genuine ISO 50 film, I believe David Ward and Joe Cornish rate it as such which wasn't the case with the original.

I'll do my best to add to my original post as it seems to be of interest to quite a few.
 
I checked the datasheet on Fuji Professional, it says NR for 64 seconds i.e so not past 32 se3conds.
 
I assumed it meant for anything between 32 seconds and 63 seconds +1. It's a pretty big gap between 32 and 64 seconds :thinking:.
 
I know it's just a stop but for long exposures 1/3, 1/2 or even 2/3 of a stop more than 32 seconds can make a pretty big difference with water and clouds. It just seems a bit vague.
 
It messes up the colour apparently with it shifting towards the green so much that its uncorrectable and it is apparently goes massively over exposed from what I have heard.

For Efke IR820 here are the corrected times of the datasheet:

Time measured Time actually required
1------------------1 to 2
2------------------3 to 4
4------------------8
8------------------24
15-----------------60
30-----------------180
 
Arkady said:
I have the data sheets for most of the Ilford stuff if anyone's interested - all on PDF...
Can you attach PDFs to PMs...?

apparently not: anyone interested, PM me you email address and I'll send them over...

100 Delta
400 Delta
3200 Delta
FP4
Portra 400
SFX 200
T-Max
XP2-S

ID-11, Perceptol and Microphen
Kodak Exposure Guide
Click to expand...

you got my email addy nudge budge :D
 
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