Could someone please help me identify the shutter on this 7" f/5 Vesta portrait lens? The shutter is incredibly simple. It only has T, B and I and no other speed. The letter I is for Instant, I suppose. The last time I used this lens was in 2005 and, alas, I can't remember how it works! I don't see anything that resembles a cocking lever and it is driving me nuts. The aperture selector and the aperture blades move smoothly. But I can't figure out the shutter! Not sure if the shutter is frozen from not getting any exercise for over a decade. But I can't even see how to cock it! There is a plunger type thing next to the cable release receptacle (I marked it as 'What's This?), I am not sure what it does. How does this thing work? Thanks for your help.
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