Lensball can be used in many different ways. The question is how does the image changes if you use the lens wide open or slower apertures are used. Should you focus on the middle of the lensball or on its "edge" and how the aperture can change it? We have tested it with Rollei Lensball 90mm and Panasonic Lumix GH5 II camera using the Leica 10-25mm F1.7 lens
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