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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 25 Jan 2005 (Tuesday) 16:34
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What makes a lens a macro lens?

 
SkipD
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May 09, 2013 12:39 |  #31

Pobinr wrote in post #15914932 (external link)
That was a good way to find out. So image is 3.33 times larger on sensor with 100mm macro lens.

Yup... That is, if you are looking at the maximum image sizes possible from both lenses.


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May 09, 2013 19:38 |  #32

Scottes wrote in post #391271 (external link)
Yes, the Macro can be used for anything. Macros generally have excellent optics and are sharp and high in contrast. They don't make the greatest general-purpose lenses because they are often quite slow to autofocus.

the 24-70 F2.8 is a macro lens. :) but I think I prefer flipping my 50mm F1.8 around for closeup shots. :D


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May 09, 2013 19:44 |  #33

GerryDavid wrote in post #15916246 (external link)
the 24-70 F2.8 is a macro lens. :) but I think I prefer flipping my 50mm F1.8 around for closeup shots. :D

Precisely WHICH 24-70 f/2.8 are you referring to?


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May 09, 2013 19:56 |  #34

Were on the canon forum, canon is implied. :D


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May 09, 2013 20:18 |  #35

I hate to derail this a bit, but reading the definition of a macro lens I am sure there is a formula for determining what sized extension tube you need to put on a lens to resolve the 'ideal' 1:1 ration. Most macro kits sell 3-4 tubes of various lengths. The can also be combined to create even more variables.

Say for example I want to add a tube to a 50mm? What size would I need.


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May 09, 2013 20:26 |  #36

Don_T70 wrote in post #15916324 (external link)
I hate to derail this a bit, but reading the definition of a macro lens I am sure there is a formula for determining what sized extension tube you need to put on a lens to resolve the 'ideal' 1:1 ration. Most macro kits sell 3-4 tubes of various lengths. The can also be combined to create even more variables.

Say for example I want to add a tube to a 50mm? What size would I need.

Simple...
Extension = FL in order to achieve 1:1 with the lens at Infinity focus


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May 09, 2013 21:27 |  #37

GerryDavid wrote in post #15916289 (external link)
Were on the canon forum, canon is implied. :D

there's more than one 24-70mm f2.8 though :)

and neither one of them is a real macro lens...the I says macro on the side...the II doesn't...

they both have the same minimum focus distance...but the II is .21X mag, and the I is .29X mag


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May 10, 2013 02:02 as a reply to  @ DreDaze's post |  #38

GerryDavid wrote in post #15916246 (external link)
the 24-70 F2.8 is a macro lens.

How do you figure that?
A case could be made for the EF 24-70/4L IS though, as it gives about 0.7x. That surprised me, and could make that the lens I get with my 6D, as and when, rather than a 24-105, even though I now have the 100L.




  
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May 10, 2013 10:55 as a reply to  @ xarqi's post |  #39

xarqi wrote:
...the EF 24-70/4L IS though, as it gives about 0.7x.

Where are folks getting 0.7x ?!?!?!

A macro mag and DOF calculator says 70mm at 0.38m focus distance results in 0.32x

Same calculator says 55mm at 0.35m (17-55mm) focus distance results in 0.24x
Here is shot with 55mm on 40D at 0.35m

IMAGE: http://i69.photobucket.com/albums/i63/wiltonw/POTN%202013%20Post%20Mar1/macro55mm_zps0f31aaeb.jpg

22.2 / 122 = 0.182x is the best I can actually achieve.

[edit] Gotta stop using that other macro calculator..proves that everything you use on the web is not adequately tested! Using the program which I normally use for FOV calculation at different distances, it says I would be able to capture 0.186x image in a frame size 22.5x15.0mm (20D), 80 x 121mm subject area...virtually identical to what I shot with my 40D (which has a somewhat smaller frame than the 20D)

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May 10, 2013 11:06 |  #40

robertwgross wrote in post #391457 (external link)
Somebody correct me if I am wrong on this. It is conjecture.

That's basically how some lenses work. The 100 2.8 USM macro doesn't really do this, it has an internal focusing design so it doesn't extend as you approach 1:1 but the older 100 2.8 non-USM macro relies on extending and gets quite a bit longer.

I don't consider a lens a true macro lens unless it can reach 1:1 magnification.


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May 10, 2013 11:07 |  #41

xarqi wrote in post #15917167 (external link)
How do you figure that?
A case could be made for the EF 24-70/4L IS though, as it gives about 0.7x. That surprised me, and could make that the lens I get with my 6D, as and when, rather than a 24-105, even though I now have the 100L.

On the focus ring it says macro, it may say elsehwere but I havent paid attention. I just know I can focus pretty closely with it, a lot closer than my 85mm lens. :)


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May 10, 2013 11:58 |  #42

Wilt wrote in post #15918191 (external link)
Where are folks getting 0.7x ?!?!?!

A macro mag and DOF calculator says 70mm at 0.38m focus distance results in 0.32x

you do realize, he switched it up on you there...he's talking about the 24-70f4IS

which MFD is .20 meters, and has .7X mag


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May 10, 2013 13:41 |  #43

GerryDavid wrote in post #15918236 (external link)
On the focus ring it says macro, it may say elsehwere but I havent paid attention. I just know I can focus pretty closely with it, a lot closer than my 85mm lens. :)

I ask again.... PRECISELY which 24-70 lens are you referring to?


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May 10, 2013 14:53 |  #44

DreDaze wrote in post #15918413 (external link)
you do realize, he switched it up on you there...he's talking about the 24-70f4IS

which MFD is .20 meters, and has .7X mag

But 70mm at 0.2m focus distance yields 0.538x. The frame area captured by FF camera with 70mm at 0.2m is 0.044571m x 0.066857m within a 24x36mm frame.

[edit] Canon is playing FL games again, to achieve its claim, "has a macro mode at the telephoto end with up to 0.7x magnification (minimum focusing distance becomes 7.87 in./0.2m)". One needs about 82mm FL to achieve 0.7x at focus distance of 0.2m
In non-macro mode the MFD is 0.38m like the f/2.8 II lens, but drops to 0.2m MFD when in macro mode


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May 10, 2013 14:59 |  #45

Wilt wrote in post #15918985 (external link)
But 70mm at 0.2m focus distance yields 0.538x

frame area captured by FF camera is 0.044571m x 0.066857m within a 24x36mm frame.

but doesn't the new 24-70mm have a weird way of working...i mean looking at it, it looks as though it goes past 70mm when it's in the macro mode


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What makes a lens a macro lens?
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