A little thought tells me that Pete may be right that the blur is proportionally larger for angular movement depending on the size of the format. For translational movement, I don't think this is so. One of the photo mags had a feature on resolution loss with handholding a 35 mm some years ago. The conclusion was that, for most people, the 1/focal length rule for the shutter spped was too liberal by a stop, but that at double that speed there was no loss in resolution from the very fast speds such as 1/1000. Then, as others have pointed out, one has to admit that the greater mass of the LF camera and the leaf (vs. focal plane w/ reflex mirror) shutter should allow hand holding at a slower spedd with equivalent results. Since the LF photographer can use 400 speed film easily for most work without objectionable grain, and since the sunny 16 rule modification for full shade is about f5.6, this gives 1/400 @ f5.6 for full shade. With a 135 or 150 mm lens, this is more than adequate if the study is to be believed, and 1/250 should work, or something even slower if the greater mass of the camera and the leaf shutter improve results some. While hand holding inside without flash might result in some degradation, it seems that much could be done outdoors even on an overcast day or later in the day. If you had a Xenar (f2.8?) you could do even better. If you braced on a wall or had a monopod, that would extend the range, too. I've about got myself convinced to try it.
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