Greg, > Has anyone ever experimented with a camera with an off center aperture so that when you stopped down to the smallest opening, instead of the opening being centered behind the lens, it is off to one side? I would imagine the image would be less sharp and I would imagine you would likely have vignetting but would you have the same effect as shifting the lens? Would you be able to even focus such a lens? I am not sure there was much discussion about this but I would think that there should be no major noticeable effect with placing the aperture off center. In fact, any point or area of the lens will form an identical image of the scene as any other point (except for a little parallax discrepancy I believe). This is the principle by which more and more luminous images of a scene are made as the aperture is opened up. More and more points on the lens contribute more and more images of the scene on top of each other (so to speak) and this makes the image brighter. I hope I am not too far off or I will have egg on my face! Andy
