Hi, Re Barrel lenses Is there any kind of affordable device/accessory (i.e., some kind of flap, etc.) available on the market that one easily and somewhat hermetically--w/o much vib ration--stop the exposure on a barrel lens. I know of the hat tricks, lens cap, possibilities, but the light loss and vibration seems to be a draw back. Relatedly, with a Packard shutter, is there a B-setting where you can close the shutter at will? Are these shutters easy to use and affordable? Other options? Thanks in advance, Mike
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