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ABOUT TRIPOD, HEAD AND VIBRATION

MARCH 2005

This will pose an even more serious situation in digital image sensors.

[Arca Swiss B1 #1]

[Without Mirror Lock Up]

[Arca Swiss B1 #2]

After I built a simulation program with real vibra- tion data, I became inclined to do the simula- tion for MLU case, too. I put the ‘NO MLU/MLU’ data and got following images. The vibration is not only worsening the resolution but also wea- kening the contrast.

As you see in the example without using MLU, all the surrounding donuts have to work together to build a visible image. So if the neighbor of one donut with red color is blue, the film will record the red donut with blue casting, resulting purple.

[With Mirror Lock Up] Vibration weakens the contrast a lot. Machine Gun Test: Motor Drive

Here is another fun test. The Nikon D2H was shot continuously in two different setups. The very first photo in this article was taken while doing this experiment. The front of camera was tilted about 15 degree downward. Vibration was measured by a laser vibrometer having 0.1um/s of velocity resolution.

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One setup was built with FOBA and Manfrotto (Bogen) 055 and the other with the Titan Atlas Markins M1030 and Gitzo.31

Let's look at the results of Nikon D2H, the same shutter box is used in Nikon F5. Result just below is by Markins M10 setup.

VIBRATION AMPLITUDE [um]

20 15 10 5 0

  • -

    5

  • -

    10

  • -

    15

  • -

    20

0.0

0.5 1.0 TIME IN SECOND

1.5

Following is the result using Manfrotto 055 tripod and FOBA. I’m pretty sure that no better result could be expected with Arca Swiss B1 consider- ing all the previous results that it shows micro slip in extreme conditions like a big load or a high frequency load.

30 Do you recognize the M10 ball head with white ball? It is the one on the test bar movie at Markins home- page that is severely tortured for years. I guess this M10 is the most unfortunate Q-Ball head ever made. Other ball heads meet great owners and share the joy of taking photography, and see the world. But this M-10 always holds the test bar, only taking cameras without film. And even sometimes, Mr. Mah hangs over the test bar to show its holding force to office visitors. So I am adding special comment for that spe- cific M10 here.

31 Arca Swiss B1 on Manfrotto 055 is an unbalanced setup in my opinion. Too heavy thing on weak tripod is not good. We already have Nikon D2H on it. So I didn’t try that combination.

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