An extension tube - is used with interchangeable lenses to focus closer, useful in macro photography. The tube contains no optical elements; its sole purpose is to move the lens farther from the image plane. The farther away the lens is, the closer the focus, the greater the magnification, and also ...
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How can I calculate what the effect of an extension tube will be?
There must be a mathematical description of the difference that an extension tube makes to a lens -- is it something that can be easily described?
(For example, with teleconverters you can say things ...
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1answer
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1answer
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How can I calculate the change an extension tube makes to the maximum magnification of a lens? [duplicate]
Possible Duplicate:
How can I calculate what the effect of an extension tube will be?
My understanding is that extension tubes increase the magnification of lenses by reducing their minimum ...
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2answers
1k views
Which suits better for hobby usage: extension tubes vs. close-up filter?
I am looking to do a little macro work, but am not ready to invest in a macro lens. For hobby work like photographing flowers and such would it be better to invest in a set of extension tubes or in a ...
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7answers
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What am I losing when using extension tubes instead of a macro lens?
After playing around with macro photography on-the-cheap (read: reversed lens, rev. lens mounted on a straight lens, passive extension tubes), I would like to get further with this. The problems with ...
11
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2answers
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What are the biggest differences between Reversal Rings, Extension Tubes and Macro Lenses?
As far as I understand all three options help you do macro photography but are their other reasons for having the three different items? I figured reversal rings and extension tubes were just for the ...
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5answers
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Macro photography with an ultra-wide lens and extension tubes?
While reading some reviews of Canon EF-S 10-22mm f/3.5-4.5 USM, I was a bit surprised to notice that the lens is supposed to be compatible with 12mm and 25mm extension tubes, and with those one should ...
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Does a camera's crop factor apply to the magnification of macro shots?
If I have a lenses (or in my case extension tubes) that would allow the lens to magnify 1:1, does a 1.5x crop factor body make it really 1.5:1 ?
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How do I choose an extension tube for macro photography?
I'm looking for an extension tube for my DSLR. Any suggestions? I see a lot on the internet, but I cannot figure out which is the best.
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Extension tube set elements
My extension tube set (Soligor for Pentax AF + P/KA) was not working correctly on my DSLR, so I checked the tubes, and found an interesting difference. It has three tubes (12mm, 20mm, 36mm).
This is ...
6
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4answers
940 views
Where can I get an extension tube for micro-four-thirds lenses?
There doesn't seem to be any extension tube set listed on the m4/3 section of the Four Thirds website. Olympus makes the EX-25 extension tube but it's for regular Four Thirds lenses.
I would like to ...
5
votes
3answers
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Kenko extension tubes or no name tubes?
I'm planning to buy extension tubes for my Canon 50mm f1.8 lens. I found Kenko for about $150 but then again there are the others which are going for about $10 or less which does not mention of a ...
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How much does extending affect range of focusing distances?
It's well known that moving a lens away from imaging surface will decrease both minimum and maximum focusing distance. There are times when it would be good to know how much those distances will ...
