ABOUT TRIPOD, HEAD AND VIBRATION
PAGE 14 OF 15
Previous results are the vibrations in different se- tup using a Hasselblad with macro bellows. With above measured data, we can visualize the dif- ference, again by assuming donuts of 0.005mm in diameter.
if there is no motion, the result will be a 430 for each black pixel. Then the pixel with value of 430 will be saved as black in image file and val- ue 0 will be saved as white.
means we need an enlargement between 8x and 32x to see the detail in the negative.”
This again means that in 20”x24” enlargement you can see the difference. And if you record your image with a very stable support, you will see the detail which you cannot see in a smaller print. A whole new world is just in front of you. It’s not just about resolution; the whole things are different including contrast or color definition.
[Resulting brush size: Base vs. Column]
[0.005mm donuts, same as the donuts image on the left column]
I’ve tested and compared with several cameras and lenses in different situations. And I can easily conclude that using a Markins tripod base is simply a better solution. Also to get a stable sup- port, avoid using any soft material along the support. So avoid plate or any modules with cork, rubber on top. It will increase the amplitude and decrease damping. Soft materials will not work as a damper unless your gear is really light as in case of a point–n-shot camera.
And as the aperture changes the size of donuts will also change. In next example the donuts di- ameter is set 0.01mm. Both are simulated with the same vibration traces.
This report can be written and posted with a great help and advice from Mr. Mah, who de- signed the Markins Q-Ball head series. I tried to visualize what I learned from him through his words and photos using my knowledge and background.
With a small (considering the amount we spent on lens and body upgrade) investment and ef- fort, we can get much better pictures. And we should believe that we can make a better pic- ture using current cameras and glasses. They can perform better if we provide them with a more stable support.
I’m a usual guy. I used and upgraded a lot of gears since I started taking photography. Until I changed my main gears to Hasselblad from Lei- ca, I paid little attention to my tripod. Mr. Mah opened my eye with the prints having stunning sharpness and contrast. It was an astonishing experience to see some subtle details in a big print that could not be seen in film even with the best loupe.
As a general guideline, I referenced that the m a x i m u m o b t a i n a b l e r e s o l u t i o n i s a b o 20~25um. But what I encountered in so many u t
Vibration Visualization Procedure: How to draw donuts
This part is to explain the procedure to draw each donut image. The image is a simulated result with the experimentally obtained real vi- bration data. I assumed a donut size of 0.005mm in diameter as a basic feature. Then actual vi- bration trace during exposure was extracted. In next image, the total data number during expo- sure is 430, and the time is about 0.2 seconds. So
[0.01mm donuts, same as the donuts image on the left column]
In Erwin Puts10 document, he mentioned that “In normal conditions and at a distance of 25cm the eye can discern about 3 to 6 Lp/mm. This