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05-09-2008, 04:34 PM   #16
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According to the mighty Newton, you can't really detect velocity with a motion sensor (constant speed gives sum of forces=0). And Pentax isn't THAT fabulous (yet...).
(Which is basically why it often may get the panning totally wrong.)

05-09-2008, 06:31 PM   #17
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QuoteOriginally posted by KjetilH Quote
According to the mighty Newton, you can't really detect velocity with a motion sensor (constant speed gives sum of forces=0). And Pentax isn't THAT fabulous (yet...).
(Which is basically why it often may get the panning totally wrong.)
Unfortunately, this is only a semi-scientific statement.

Pentax isn't fabulous, they just buy two little chips (as described in some other thread here in the forum).

Each of them measures angular velocity (as I said in my last sentence of my post up here). Unlike linear velocity, angular velocity can be measured. A rotating system isn't an inertial system. In the particular case, the gyro sensors measure the coriolis force(*) created by their rotation (around one axis each), output as a signal proportional to their angular velocity. The time differential then is the angular acceleration.

Quite stunning, not?

And yes, the two little guys can detect if you are panning or not.

--
(*) coriolis force, the force which makes the storms turn in one direction on the north half of the earth, and in the other direction down under.

Last edited by falconeye; 05-09-2008 at 06:50 PM.
05-09-2008, 10:03 PM   #18
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QuoteOriginally posted by blwnhr Quote
Now, 1/160 is not a low shutter speed in my world. Normally at focal lengths below 150mm I shoot at 1/125-1/60, this compounds the problem greatly.

For those who didn't see the other thread, here's what it looks like when it works.

K10D, Sigma 18-125 @ 125, 1/125, f/16, 1/200.

This last shot is really great.


I haven’t got a lot of experience with panning, but I tried last week at a baton race in Copenhagen. The ones without SR seemed to work best, but then I wasn’t using monopod or tripod for any of them.
The third shot was for sure with panning, and it didn’t come out so well :
Panning shots: Pentax SLR Talk Forum: Digital Photography Review

Probably should have used higher shutter speed. Top in these ones were 1/40 with a 35 mm lens.
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