 Ken Pang |
Canon Under exposure? Hey guys, Just a quick question - I've noticed recently when I shoot with 800 speed film, regardless of which lens I use, it always get it back slightly under exposed. It's most noticeable in grainer films like Fuji 800 press, but to a lesser degree in "better" films, like NGH. It never happens to 1600 speed film or 400 speed film, so I'm wondering if there is a problem with the computer calculating exposure at ISO 800. Does anyone else have a Canon that consistently under exposes on any particular ISO speed film?
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Jeff S. Kennedy |
Have you always got underexposed shots with this film or is it just recently? Knowing the answer to that would help identify if its the film or the camera. Mostly I can say that you may just need to find your personal exposure index (EI) for each film you use. Most films aren't as fast as they say and quite often you will get better results if you overexpose by one stop (IOW rate it at half the stated ISO). This is especially true of negative films. If you've received good exposures rating it normally in the past then maybe you need to have your meter calibration checked.
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Ken Pang |
Thanks for your answer Jeff. I couldn't really answer your questions without further testing. I was given a two boxes of the Fuji press film and after shooting a two rolls when I first got it, I decided not to use it because I was unhappy with the results. I pulled it out recently (being out of NHG) and once again was unhappy with the results, but decided to be a little critical about it why I was unhappy about it. I came down to this: 1) No colour saturation. 2) Grainy 3) Washed out look To me, that seems like it's underexposed. I pulled out some old photos shot with other 800 speed films and noticed that the ones in bright sunlight turned out very well, but the ones in overcast days or inside were consistently and significantly under exposed. What I'm thinking now is that possibly reciprocy failure may, in high speed film take effect a little earlier. Is this possible? IE, when the shutter speed falls down below 1/125th of a second or so, you need to compensate? I believe the tech docs say it doesn't happen until about the 4 second exposure mark, but it might be a bit optimistic. I might do some further testing and get back to you on this one. Ken
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Jeff S. Kennedy |
I don't think reciprocity failure is a problem at 1/125th. 800 speed film is grainy and low in contrast and saturation generally. Its the nature of the film. As I said, it is usually a good practice to slightly overexpose print film when you can.
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Ken Pang |
I found out what it was. The lab I have been using had a faulty machine that was underdeveloping all 35mm and APS film for the last 6 months and they've been compensating by pushing it during the printing process. According to the girl there, for most low speed films, this has been fine since they are usually very saturated and contrasty films anyway, but high speed films have been getting the raw end of the deal. You know the bad thing? According to the girl I talked to, the manager knows but has been refusing to fix it. Well, I guess you get what you pay for.
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Dominik M. Miklaszewski |
According to some books all films beyond 200 come slightly underexposed, I usually correct that with +1/3 or +2/3 stop.
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