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FORUMS Photo Sharing & Visual Enjoyment Macro 
Thread started 17 Nov 2005 (Thursday) 23:23
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An old tree: macro and 3D

 
rpolitsr
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Nov 17, 2005 23:23 |  #1

Pro1 in SuperMacro mode whit a 50mm f 1.4 Canon lens reversed in front of the Zoom. The reverse adapter was made at home from the description and pictures posted by kallousa (Ahmad Kallousa)

This is an experiment testing the capabilities of extreme close-up and extreme 3D effect together.

Do you think it works?

Picture of the trunk of an old tree.

IMAGE: http://sites.google.com/site/rpolitsr/rpolitsr/varios/onthenet/3d/3D_tronco2_4923-24.jpg

rafael
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LordV
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Nov 18, 2005 00:05 |  #2

Works for me rpolitsr, -certainly gives an idea of the topography (is that the right word?) of the bark. Any idea what magnification you were shooting at?
Brian V.


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rpolitsr
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Nov 18, 2005 00:37 |  #3

LordV wrote:
Works for me rpolitsr, -certainly gives an idea of the topography (is that the right word?) of the bark. Any idea what magnification you were shooting at?
Brian V.

The magnified bark resembles a picture from a ridge to my imagination. I guess that topography describes it well.

No idea about the actual magnification yet, and I do not know how to calculate it, but I saw the ruler in your thread Exciting pics of a ruler ! and I will shot some pics to find the correlation between millimeters and pixels.


rafael
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cmM
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Nov 18, 2005 00:51 |  #4

very cool shot.
I still can't quite see the effect of stereo photography (not on your image alone, one any image) but it's a great macro nonetheless.




  
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DigitalMDX
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Nov 18, 2005 00:53 as a reply to  @ cmM's post |  #5

Wow, the depth to that is insane! I love it...
Thanks for sharing!


Washington State - Canon Rebel XT

  
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rpolitsr
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Nov 18, 2005 10:58 |  #6


Thank you cmM
I spent many many hours before the first stereo pair became a 3D image to me.
I can not really cross my eyes, but using the method I described in this post of other thread, it is now easy for me to see the effect. Hope it works for you too.

DigitalMDX
Thanks for your kind words. I like to share some things I am interested in. Macro is my new toy!

LordV wrote:
Any idea what magnification you were shooting at?

Hi LordV.

This is my ruler. At left, the resized image, at right the full size crop of one millimeter:

[

IMAGE: http://sites.google.com/site/rpolitsr/rpolitsr/varios/onthenet/macro/ruler_combo.jpg

And below it is some data, measured with the Measure Tool in PhotoShop.


[FONT=courier new]
Pixels in 5mm | img. Size | pixels/mm | object size for full screen |

Pro1 Max Zoom + 50mm lens reversed
5mm=1360 pixels | size L | 272 pixels/mm | 12 x 9 mm for full screen |

Pro1 Max Zomm in SuperMacro mode + 50mm lens reversed
5mm=347 pixels | size M1 | 69 pixels/mm | 32 x 24 mm for full screen |

Pro1 Min Zoom in SuperMacro mode + 50mm lens reversed
5mm=194 pixels | size M1 | 39 pixels/mm | 58 x 43 mm for full screen |
[/FONT]

From the data above, the round hole in the bark measures 1.5mm in diameter.

rafael
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LordV
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Nov 18, 2005 11:08 |  #7

rpolitsr,
Not quite sure what you up to with the data, but the magnification factor is just measured by
sensor width in mm/ mm shown on the ruler in the pic.
For example my own camera has a sensor width of about 22mm If I take a photo with just my macro lens of the ruler I can see 22mm of rulerscale in the picture so mag factor=22/22=1 which is correct for a 1:1 macro lens.
If I put all my extension tubes on then I only get 11mm of ruler scale across the width of the picture so the magnification factor= 22/11= 2 (or 2:1)
Btw width refers to the longest side in landscape mode.
Hope that makes sense.
Brian V.


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Macro Hints and tips
Canon 600D, 40D, 5D mk2, 7D, Tamron 90mm macro, Sigma 105mm OS, Canon MPE-65,18-55 kit lens X2, canon 200mm F2.8 L, Tamron 28-70mm xrdi, Other assorted bits

  
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rpolitsr
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Nov 18, 2005 12:47 |  #8

Thank you LordV.
Now I understand the concept.
The relevant data yields the following results:

mm shown on the ruler in the pic:

12mm - Pro1 Max Zoom + 50mm lens reversed (photo in my previous post)
32mm - Pro1 Max Zomm in SuperMacro mode + 50mm lens reversed (not shown)
58mm - Pro1 Min Zoom in SuperMacro mode + 50mm lens reversed (not shown)

According to the Pro1 specs, the sensor size is 2/3 of an inch diagonal (13.1mm wide).

There is some discussion about the effective size of the sensor though, but a reasonable conclusion may be that the biggest magnification achieved with my 50mm f 1.4 Canon lens mounted in front of the Zoom with my home made tube is aprox. 1:1


rafael
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kallousa
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Nov 19, 2005 18:00 |  #9

Great shots, Mr. Polit
It works perfectly in 3D , but I was wondering about the white dots in the right picture , they make a little confusion to the final image.

Thanx for the Demo on the macro capabilities of our toy
Regards


Ahmad Kallousa
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rpolitsr
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Nov 20, 2005 11:00 |  #10

kallousa wrote:
…I was wondering about the white dots in the right picture, they make a little confusion to the final image.

I may guess that it is some kind of interaction between dust in the lens and the angle of light. The dots appear in the first of the two photos, and the only thing that changed for the second was the angle of the camera. I saw the dots later, on the computer screen.

kallousa wrote:
Thanx for the Demo on the macro capabilities of our toy

As already said, your description of the adapter and the picture of it as well as your sample photos encouraged me to build my own adapter. Thank you.


rafael
Canon EOS Rebel XT, EF-S 18-55mm f3.5-5.6 II, EF 50mm f1.8 II, EF-S 55-250mm f/4-5.6 IS STM, speedlite 430EX, basic filters set.
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An old tree: macro and 3D
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