I've been shopping around for a new tripod for my field camera and I'm wondering why, beside the poor aerodynamics of an extended field camera and increased vibration from wind, should the quality (stability) of the tripod matter any more than for a dSLR. Most tripod manufacturers class only their largest tripods as appropriate for field cameras, which makes little sense to me since field cameras weigh only 6-8 pounds with lens.
A dSLR with a very large lens weighs as much and has less even weight distribution than a field camera and so should exert considerably more torque on a ball head than would the 4x5. In terms of focal lengths, 4x5 cameras rarely go beyond 300mm, about the same as a long 135 zoom. And in terms of local sharpness, it matters far more for an APS-C digital camera than for a large format camera, which won't pick up as much resolution per square mm of sensor area due to diffraction, focusing errors, tolerances, etc.
So why do I need a very expensive tripod? If it's so the camera doesn't fall over, that's valid, since I'd rather spend money on a good tripod than bellows and ground glass repair. But in terms of performance it seems unnecessary and I'd rather bring a smaller tripod into the field.
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