The Hartblei 40/4 offers an intriguing advantage for making higher resolution stitched images: a tripod mount which keeps the lens in a fixed position, thus eliminating parallax caused by the lens being moved during a shift (the camera moves instead).
In fact, the Hartblei 40/4 is the only shift lens available today that has a tripod mount. The tripod mount is also a near-necessity, given the weight of the lens (1706g = 3 pounds 12 ounces); stressing the lens mount with the weight of the lens and the torque of shift or tilt isn’t a good idea.
While desirable, the tripod mount has a downside: there is no straightforward way to do a center/left/right stitched image, since the shift mechanism is unidirectional. However, with the lens fixed on the tripod, one can press the rotation-release lever on the lens, which allows the camera to rotate by 180°. The trick is getting 180°, instead of 170° or 185° (or whatever). It’s doable, but far from ideal. Alternative designs which allow left/right bi-directional shifting do not have this issues.
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