Originally Posted by
goamules
It looks like a Petzval to me. On older brass barrels, the knob usually means it's a petzval. For newer black lacquered barrels, they are sometimes triplets and still have a knob. Remember, most of these are projector or magic lantern lenses. They had to have a way to focus the projected image, so they almost all have knobs.
For shuttering, I use a darkslide in front of the lens and just approximate the timing (after metering). I've even been shooting ISO 400 speed that way, but I shoot in lower light settings so I can get about 1 second exposures.
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