There are two parts of my Wista 45 that I don't understand. On the 4x5 sheet film back, on the rotating part, there's a little momentary lever on one of the corners. I can't figure out what it does.
The other thing on the back I don't understand is a little silver tube on the part that clamps down on the film holder. This little tube is threaded on the inside. What's that for?
It's a little bit older model that doesn't have horizontal twisting but it does have the technical back. I've been curious what these two little things do and any help'd be great! Thanks in advance!
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