You absolutely can use spot metering for roll film (if that's what your concern is), although its more useful in shorter rolls, as in 120 (MF). I'd go as far as to say that well over half of the ZS potential can be exploited in the exposure (and pre–visualization) stage alone. Most 120 shooters, for instance, will expose a number of shots for one scene, which is likely to be the same exposure. With a little forethought, you can group these similarly exposed scenes together on one filmstrip, or its halves – separately exposed, particularly with 6X7, which results in only 10 exposures per roll. You can then develop them separately by cutting the film in half or, less destructively, average development for the entire roll, if the individual exposures vary by no more than say, 2 stops (take notes!). Most B/W negative films are more than tolerant to this spread in latitude, and VC papers can assist you in fine tuning the print.
The same procedures may be used with 135, but with a bit more care and potential wastage. Don't let that stop you!
Last edited by ROL; 03-15-2012 at 06:09 PM. Click to view previous post history.