Hello people, I am doing (analogue) photography now for about a year (nikon cam). Now I want to do some shooting tomorrow with a friend, but she has no camera, so I decided to lend her the old one that belonged to my grandfather. It is an old soviet Zenit-E with a helion lens. Now that I have spent the evening figuring out where everything is on that camera, there is one thing that bothers me: The lens has, unlike any other I have seen, a third ring, that can be used to close the aperture up to the one set to be able to see the final field of focus (sorry if I am not correct qoth the english terminology). Of course the viewfinder gets darker then. When I shift the ring, I can see aperture open and close inside the lens. Now, when I set time to infinite and look through the lens or the open camera, the aperture stays open the whole time, unless I shift the ring, wich I can do while still pressing the shutter release button. Then I see it open and close. I dont believe this is normal, the aperture should close while the shutter is open, and I should be able to see it when looking through the cam. So, is this a malfunction? If so, can I handle it, by closing the aperture "manually"? I would be very glad to recieve an answer till tomorrow so we can go shooting. Greets from Germany!