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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 30 Aug 2011 (Tuesday) 08:36
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Any idea what is the Macro Magnification in this picture?

 
commonjunks
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Aug 30, 2011 08:36 |  #1

is it 1:1 or 2:1?

https://photography-on-the.net …p?p=13023575&po​stcount=77

Thanks in advance.


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Aug 30, 2011 08:43 |  #2

I looks more than 1:1 but I am no expert at magnification ratios....


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Carlwashere
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Aug 30, 2011 09:16 |  #3

It's definitely more than 1:1. I know that much.


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commonjunks
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Aug 30, 2011 10:07 |  #4

Thank you all who look through this thread and specially those who comment.
Here i found a link from help of another forum clubsnap (external link) https://photography-on-the.net ….php?p=104627&p​ostcount=5

Looking at this formula magnification is
((12+20+36+7.5)/50)*1.​4=2.114 (around 2x)
12+20+36 = extension tubes
1.4 = TC


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The ­ Ran
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Aug 30, 2011 19:31 |  #5

Where did the 7.5mm extension come from? But yeah that is correct, extension divided by focal length gives the magnification factor, plus the 1.4x from the TC and it should come out to 1.9:1.


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Aug 30, 2011 19:40 |  #6

commonjunks wrote in post #13023912 (external link)
is it 1:1 or 2:1?

https://photography-on-the.net …p?p=13023575&po​stcount=77

Thanks in advance.

If you have a sample of the bill that was photographed, it would be easy to determine the magnification ratio. The 7D sensor is 22.3 mm wide. How wide is the original artwork that makes up the image? Do a little simple math and the job is done. Tell us the dimension of the original artwork (the part captured in the image) and we can do the math if need be.


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The ­ Ran
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Aug 30, 2011 19:53 |  #7

The link actually show the full note, or at least the height, so if we can find that out we can do it that way. The Wikipedia article for Singapore dollars shows the 50 note to be 74mm heigh, I'll let someone else calculate the size of the eye.

http://en.wikipedia.or​g …est_.28portrait​.29_series (external link)


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Aug 30, 2011 20:00 |  #8

IF you're unsure, photo graph a ruler (tape measure, etc) then the ratio is the sensor size to the length measured in the picture.


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SkipD
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Aug 30, 2011 20:32 |  #9

Assuming the note is 74 mm high, I figure the image of the eye is of an area that is roughly 20.8 mm wide. The 7D's sensor is 22.3 mm wide. Thus, the magnification is in the neighborhood of 1.07:1.


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arentol
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Aug 30, 2011 21:40 |  #10

http://www.cambridgein​colour.com …tension-tubes-closeup.htm (external link)

0.15x native magnification, 50mm lens, 68mm of tubes = 1.51
1.51*1.4 = 2.114x


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Aug 30, 2011 22:14 |  #11

Here is a near lifesize photo of the Singapore $50. By my rough calculations, I would say the rectangle around the eye is about 11mm x 7mm. If the 7D sensor is 22.3mm x 14.9 mm, that would be about twice lifesize or 2:1

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Aug 30, 2011 23:21 |  #12

The shot was taken with three Kenko tubes...12+20+36mm = 68mm of extension. If the lens was used at Infinity, the magnification would be 68/50 or 1.36:1
But if the 50mm f/1.8 lens were used at MFD, one could capture 2.6:1


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commonjunks
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Aug 31, 2011 01:38 |  #13

BTW i did photograph ruler with 7D

7D, 50mmII, 3 Kenko Tube, 1.4TC

IMAGE: http://farm7.static.flickr.com/6068/6096781410_0a189c65b5_o.jpg
around 11mm.

Here for reference what is the exact size
7D, 50mmII, 1.4TC
IMAGE: http://farm7.static.flickr.com/6182/6096781566_27f0ae22a0_o.jpg

Mike reference with respect to note is right.

BTW it is manual focus.

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Any idea what is the Macro Magnification in this picture?
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