I have just purchased a Kodak Ektar 127mm f4.7 lens in a Graphex shutter. Speeds T, B, 1, 2, ... 50 are etched in red on the shutter ring; speeds 100, 200 and 400 in black. On the other side of the shutter ring is a separate panel about 1" wide with a lever which stops at (and selects) the following detents, from right to left: "Off" etched in black, "F-X" etched in red-black respectively, "M" in red, and "M" in black. The red and black lettering is obviously related, but:
1. What do "M," "F-X" and "Off" mean, and
2. How do I set shutter speeds?
Merci mille fois!
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