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I have a lens I made from scavenging parts and I'm trying to figure out the f/stop. The ridiculous f/0.46 isn't of course remotely possible, but I'd at least like some idea of what it really is. I took some photos with it and another lens in the exact same lighting conditions, for comparison (pic). I didn't take to many pains to get things into focus. Especially, since I could barely see anything in the LCD screen.
Any help here? I'm getting anything from f/1.85 to f/046.