How to use extension tube ?


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locksley

New Member
Jan 26, 2004
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#1
Hi All,

My friend just passed my a set of extension tubes (12mm ,20mm, and 36mm)

May I know how to use it for marco shoot ?
And how to do the calculation ?

THanks :)
 

rainman

Senior Member
Apr 4, 2004
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#2
It simply reduces the mimimum focus distance...thats mean u go nearer to the object. So when u go nearer to shoot ur object becomes bigger loh! :)

a 50mm lens need a 50mm extension to reach 1:1 magnification
Think should be a ratio calculation...let other experts enlighten u..keke
 

Echo22

New Member
Jun 16, 2004
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#4
rainman said:
a 50mm lens need a 50mm extension to reach 1:1 magnification
Think should be a ratio calculation...let other experts enlighten u..keke
can anyone enlighten me the distance you are from the object and the different zoom will give you wat kind of magnification ratio, how to calculate?

thankz
 

behyx

Senior Member
Jun 15, 2002
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www.danielbeh.com
#6
1 more question: does extension tubes affect the amount of light entering the lens?
 

Adzz

Senior Member
Jun 20, 2004
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#7
behyx said:
1 more question: does extension tubes affect the amount of light entering the lens?
I guess not, but since light travels a longer distance in the lens, the light quality is somehow affected.
 

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