[Leica] spinning the ring is bunk

[Jim Brick <jim@brick.org>]

Most photographs exhibit a look based on a particular f/stop which defines
the Depth Of Field. Change the DOF and a photograph is not the same.
Bracketing is accomplished by changing the shutter speed, not the aperture.
If you run the aperture "ring" from one end to the other, you'll have
brackets with no DOF through max DOF. The correct exposure may not have the
proper DOF. This is why being able to set 1/2 shutter speeds on the Leica
R7 & R8 (200 series Hasselblads as well) is a great feature. Auto
bracketing uses the shutter speeds. The Hasselblad 203 & 205 will
autobracket up to 21 exposures. Ten over and ten under, plus the set
exposure (=21) by the selected EV difference. I personally use 2/3 EV. All
by automatically adjusting the shutter speed.

Of course, if you spin the shutter speed ring from one end to the other,
you had better have a static subject and be on a tripod.

Basically, spinning either ring from one end to the other is a bunch of
hooey. It just will not produce the desired photograph any way other than
sheer luck. Bracketing usually only covers three exposures. One plus, one
minus, and one at the set exposure. In this case, either the f/stop or
shutter could be used, depending of course, upon the desired result.

Jim