Wondering if someone can answer a question that's been puzzling me for a while.
I've been reading about the Arca Swiss RM3D, and I'm wondering if, when you use front tilt, the lens is rotated about it's rear nodal point? i.e. as in a traditional view camera front standard design, so that the distance between the film plane (sensor) and the rear nodal point of the lens doesn't change as the lens is tilted - and consequently the subject shape isn't altered by the degree of tilt.
The reason that I ask is that the lens boards for the Arca vary quite a lot in depth - e.g. recessed for the 24mm, very extended for the 120mm. I can't see how the RM3D keeps the rear nodal point of each lens on the axis of rotation (which would appear to be fixed) and thus avoids actually moving the entire lens assembly when tilted - which would alter the subject shape relative to the degree of tilt.
I guess this question is equally applicable to the Sinar Artec which would appear to use a 'one-axis-of-rotation-suits-all' approach as well.
I've been reading about the Arca Swiss RM3D, and I'm wondering if, when you use front tilt, the lens is rotated about it's rear nodal point? i.e. as in a traditional view camera front standard design, so that the distance between the film plane (sensor) and the rear nodal point of the lens doesn't change as the lens is tilted - and consequently the subject shape isn't altered by the degree of tilt.
The reason that I ask is that the lens boards for the Arca vary quite a lot in depth - e.g. recessed for the 24mm, very extended for the 120mm. I can't see how the RM3D keeps the rear nodal point of each lens on the axis of rotation (which would appear to be fixed) and thus avoids actually moving the entire lens assembly when tilted - which would alter the subject shape relative to the degree of tilt.
I guess this question is equally applicable to the Sinar Artec which would appear to use a 'one-axis-of-rotation-suits-all' approach as well.