I've a Calumet 5x4 camera, and I see many (eBay) offers for barrel lenses, but do not know how they are used in practice.
I understand a shutter can be fitted to the lens (or the other way around) but ignoring that option how could/would/should a barrel lens be used.
Without a shutter, I assume a barrel lens could not be used for sub-1 second speeds.
Therefore, I assume, the usable speeds are in excess of one second.
4x5 Sheet film is typically 100 asa or faster, so can these lenses be used in daylight even at (say) f32?
Typically, what length of exposure minimises the risk of serious under/over exposure; for instance a one-second error at 20s would not be as noticeable as a one-second error at 5s exposure?
In ignorance,
regards
Tony
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