- Joined
- May 5, 2012
- Messages
- 11
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- Large Format
Sorry, just to clarify, I'm using a standard incident Light Meter. A Sekonic L-358.
Thanks for the replies. A bit more research and I've discovered essentially what I'm dealing with is Bellows Extension Compensation on a large scale. I've jumped from 4x5" where I never needed to worry about it, to UULF 1mx1m upwards, where it is essential.
Now I'm standing inside my camera, trying to work out the exposure with my light meter, when possibly what I should have been doing is working out the focal length or magnification, and apply these figures to the Belows Extension Compensation calculation.
Ideally, I'd still like to try and somehow meter the exposure from inside, but again, as I am taking the reading from the film plane, the light will not pass through any aperture, and thus that figure should be irrelevant. So when setting/reading the meter, that's what I proposed f1.0, because its the largest the meter will go.
Hope I havent confused anyone! Love to see or hear of some examples of workflow doing shots 1m x 1m (40"x40") or larger.
Cheers,
Matt.
Ideally, I'd still like to try and somehow meter the exposure from inside, but again, as I am taking the reading from the film plane, the light will not pass through any aperture, ....
Well, this confuses me. Having been in a Camera Obscura once or twice... the light comes into the camera through a hole (aperture). Whether that needs to be set on the meter or not I have inadequate eperience. I thought so, and still think so... but holmburgers point about measuring this light just as one would measure exposure on an enlarger table makes perfect sense. I'd belive him, or look up a book that talks about measuring enlarger exposure, or do some test strips. If the meter is sensitive enough you can do what you want to do with no problem. If not sensitive enough, follow the direction given in Chan Trans earlier post.
Haven't read all the replies, but indeed, if you're inside the camera, set the aperture to f/1.0, which is equivalent to telling the meter there is no aperture. With a known ISO, the shutter speed will tell you the right time for exposure.
An oft misunderstood concept. In theory, the same technique (using f/1) would work under an enlarger too.
I don't think f/1.0 is equivalent to having no aperture. If that were the case, apertures larger than f/1.0 would be impossible, yet there are lenses faster than f/1 and they certainly do not magnify light.
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