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02-17-2012, 10:49 AM   #1
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Long exposure / provia 200 : how to know the good exposure compensation ?

Hello everyone !

I just bought some Fuji Superia 200, for the week end, and i wanted to try my first long exposure with film.

But i'm not sūre to understand how to calculate the compensation i need to apply

Here is what Fuji said about the long exposure compensation :

"No exposure or color balance compensation is required
for exposures within a 1/4000 to 2 second shutter
speed range. However, for exposures of 4 seconds or
longer, provide the compensations indicated below.

Exposure Time (sec) | 1/400 - 2 | 4 | 16 | 64 |
Exposure Corrections* | unnecessary | +1/3 | +2/3 | +1 |

* "+" followed by number = required increase in lens opening.

Except for special effects, the normal intensity ratio for
main-to-fill subject lighting should remain within 1:4
limits.

So if, according to my meter, i should expose say 128 sec, i should in reality expose 512 sec ?

thanks a lot to anyone who can help me

02-17-2012, 11:08 AM   #2
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According to this, http://www.fujifilmusa.com/shared/bin/ProfessionalFilmDataGuide.pdf anything past 64 seconds metered require +1 stop exposure. So for a meter reading of 128s, you should expose for 256s.
02-17-2012, 03:45 PM   #3
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I use Superia 200; print film is pretty forgiving with exposure times. When doing night shots, which are usually less than a minute in fairly well-lit harbours, I usually add half a stop to everything. If it's particularly dark I might add a whole stop.
If you have a scanner you can always tweak a little bit to do reprints. Or, if you have them printed at a lab, you could ask them to print a little lighter or darker to adjust the prints.
Bonne chance
02-18-2012, 06:58 PM   #4
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Superia 200 does pretty well in long exposures. You can either expose one stop longer, as recommended above or you might consider opening the aperture a stop instead if the longer time introduces problems (motion, etc).

If we follow the compensation pattern you would add 1/3 stop for every quadrupling of exposure time from 4 seconds on. For 128 seconds I would expose 1 1/3 stops over or about 340 seconds.

2 4 16 64 256 1024 4096 Metered Exposure

2 6 27 128 681 3400 16384 Compensated Exposure

0 1/3 2/3 1 1 1/3 1 2/3 2 F-Stop Increase in Exposure

I'm not sure how linear this continues beyond 64 seconds, but this is a good starting point. As with using any new film, test for your conditions and take good notes!


Last edited by nightfly; 02-18-2012 at 07:30 PM. Reason: Add more data
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