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Mar 16, 2012 21:12:54   #
hangman45 Loc: Hueytown Alabama
 
Some 1:1 couple I added tubes to it don't know what that ends up

1:1
1:1...

1:1 plus tubes
1:1 plus tubes...

1:1
1:1...

1:1
1:1...

1:1 plus tubes
1:1 plus tubes...

1:1 plus tubes on a clover flower
1:1 plus tubes on a clover flower...

1:1 plus tubes tiny spider on a blade of grass
1:1 plus tubes tiny spider on a blade of grass...

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Mar 16, 2012 21:57:31   #
Bunny-Jean Loc: Wisconsin
 
Excellent!!!!!! love these shots!!!!

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Mar 16, 2012 22:35:58   #
naturepics43 Loc: Hocking Co. Ohio - USA
 
hangman45 wrote:
Some 1:1 couple I added tubes to it don't know what that ends up


Great images! Amazing DOF.

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Mar 16, 2012 22:54:49   #
RocketScientist Loc: Littleton, Colorado
 
Nice shots.

You can figure out the magnification with various combinations of tubes by determining the width of your sensor and shooting pictures of the metric side of a tape measure or ruler.

http://www.uglyhedgehog.com/t-26503-1.html

The picture has measurements.



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Mar 16, 2012 23:10:40   #
Nikonian72 Loc: Chico CA
 
A few enlargements.







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Mar 16, 2012 23:30:22   #
Nikonian72 Loc: Chico CA
 
hangman45 wrote:
Some 1:1 couple I added tubes to it don't know what that ends up
I want you to photograph a metric ruler (millimeters) at closest focus (should be 1:1), then photograph same with tubes. Here is my set of "calibration" photos.

105-mm MWD field of view = 1:1 (life-size)
105-mm MWD field of view = 1:1 (life-size)...

105-mm MWD field with 68-mm tubes = 4:1 (4x life-size)
105-mm MWD field with 68-mm tubes = 4:1 (4x life-s...

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Mar 16, 2012 23:39:03   #
RocketScientist Loc: Littleton, Colorado
 
Nikonian72 wrote:
hangman45 wrote:
Some 1:1 couple I added tubes to it don't know what that ends up
I want you to photograph a metric ruler (millimeters) at closest focus (should be 1:1), then photograph same with tubes. Here is my set of "calibration" photos.
I'm confused. Isn't that second ruler shot 2:1? Unless my math is wrong, 4:1 would be 5.9mm. Please correct me if I do have my head up my butt.

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Mar 16, 2012 23:46:00   #
Nikonian72 Loc: Chico CA
 
RocketScientist wrote:
Isn't that second ruler shot 2:1? Unless my math is wrong, 4:1 would be 5.9mm. Please correct me if I do have my head up my butt.
1/2 as wide, and 1/2 as high = 1/4 original area = 4:1 magnification = 4x life-size.

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Mar 17, 2012 00:29:33   #
RocketScientist Loc: Littleton, Colorado
 
Nikonian72 wrote:
1/2 as wide, and 1/2 as high = 1/4 original area = 4:1 magnification = 4x life-size.
Gotcha. I should have realized that. Thanks for the rectal craniectomy. (That's medical speak for the act of pulling a person's head out of his butt.)

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Mar 17, 2012 12:31:44   #
MJL Loc: Wild Rose, Wisconsin
 
Very nice! I especially like #5. Cool looking spider.

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Mar 17, 2012 16:06:24   #
hangman45 Loc: Hueytown Alabama
 
Here are the shots of a metric ruler on an APS-C sensor (23.6-mm x 15.7-mm):

No tubes = 24-mm wide = 1:1 magnification = life-size
No tubes = 24-mm wide = 1:1 magnification = life-s...

65mm tubes = 12.5-mm = approx 4:1 magnification = 4x life-size
65mm tubes = 12.5-mm = approx 4:1 magnification = ...

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Mar 17, 2012 17:57:01   #
Nikonian72 Loc: Chico CA
 
hangman45 wrote:
Here are the shots of a metric ruler
Excellent! MFM re-labeled your images with magnification equivalence.

For your own reference, you may want to use the same technique with individual tubes.

What lens are you using?

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Mar 19, 2012 17:04:22   #
Country's Mama Loc: Michigan
 
Ok I get this. But once I take the picture at 1:1 then crop it how can I figure out if it is a 50% crop 30% etc.? As you can tell math has never been my long suit.

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Mar 19, 2012 19:16:31   #
tinosa Loc: Grand Rapids Michigan
 
Nikonian72 wrote:
1/2 as wide, and 1/2 as high = 1/4 original area = 4:1 magnification = 4x life-size.
Thank you, that straightens me out on these ratios that I have never quite understood.
Very much appreciated.

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Mar 19, 2012 21:19:14   #
Nikonian72 Loc: Chico CA
 
Country's Mama wrote:
Ok I get this. But once I take the picture at 1:1 then crop it how can I figure out if it is a 50% crop 30% etc.?
There are a few methods used to calculate magnification, but here is the simplest, which works quite well.
1.)Estimate the ratio of subject length to width or height of field.
Example = at 1:1, bee length is 1/4 width of field.
2.) Crop until subject (bee) fills 1/2 width of field. You have increased length of bee by 2x, and height by 2x.
2 x 2 = 4:1 magnification = 4x life-size.
-or-
3.) Crop tightly, until subject (bee) completely fills width of field. You have increased length of bee by 4x, and height by 4x.
4 x 4 = 16:1 magnification = 16x life-size.

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