Would someone in the know tell me the operation of this lens, please? I can't believe I'm unable to figure it out. I understand what C, H, G, and A (probably) are used for. <duh> I'm simply trying to open the aperture to compose a scene and can't figure out why I'm unable to do so. If I press F inward it automatically fires the shutter at whatever speed I have it set at, a second after pressing F. Item D doesn't move. I can move B downward (as shown in the image).
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