extension tubes on a 100macro

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Archive 2004 · extension tubes on a 100macro

dan hillis
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p.1 #1 · extension tubes on a 100macro

What will the efect be on a 100mm macro using extension tubes? im planning on get a set of kenko's (12,20 and 36mm). Will this greatly enhance the magnifaction?
If so what will be the greatest magnifaction that I will get using the set.

As allways thanks for the needed info.......dan

Jun 05, 2004 at 08:52 PM

dan hillis
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p.1 #2 · extension tubes on a 100macro

Jun 06, 2004 at 02:05 AM

jmcfadden
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p.1 #3 · extension tubes on a 100macro

It will make the distance to subject Very , Very small indeed , basically if you understand what a macro lens is actually doing , it is *adding* extension tubes to *itself* this is why if you put the camera in aperutre priority at the maximum aperture ie f3.5 and then turn the focus ring to 1:1 the aperture value will have increased somewhat because you are losing light as you gain extension

J

Jun 06, 2004 at 02:09 AM

dan hillis
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p.1 #4 · extension tubes on a 100macro

jmcfadden wrote:
It will make the distance to subject Very , Very small indeed , basically if you understand what a macro lens is actually doing , it is *adding* extension tubes to *itself* this is why if you put the camera in aperutre priority at the maximum aperture ie f3.5 and then turn the focus ring to 1:1 the aperture value will have increased somewhat because you are losing light as you gain extension

J

Thanks John! so other than making the distance to subject very small (short ?) it will not change the magnifaction? BTW how do you like that new D70. thanks again dan

Jun 06, 2004 at 02:29 AM

jmcfadden
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p.1 #5 · extension tubes on a 100macro

Dan

I love the d70

of course as minimum distance to subject is lessened the mag factor will of course follow !

There is some math to this , but I could care less about the numbers

but if you gotta know , ask Tom , he knows how to do the math

Jun 06, 2004 at 02:36 AM

troglo
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p.1 #6 · extension tubes on a 100macro

Hello dan

Magnification will be "nearly" 1,7:1
Witha 50 macro(1:1) and same set of extension it will be nearly 2.5:1.
Denis

Jun 06, 2004 at 03:57 PM


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