Some 1:1 couple I added tubes to it don't know what that ends up
1:1
1:1 plus tubes
1:1
1:1
1:1 plus tubes
1:1 plus tubes on a clover flower
1:1 plus tubes tiny spider on a blade of grass
Excellent!!!!!! love these shots!!!!
hangman45 wrote:
Some 1:1 couple I added tubes to it don't know what that ends up
Great images! Amazing DOF.
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.htmlThe picture has measurements.
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 with 68-mm tubes = 4:1 (4x life-size)
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.
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.
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.)
MJL
Loc: Wild Rose, Wisconsin
Very nice! I especially like #5. Cool looking spider.
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
65mm tubes = 12.5-mm = approx 4:1 magnification = 4x life-size
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?
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.
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.
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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