Author Topic: macro extender rings  (Read 2278 times)

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Offline didispeed

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macro extender rings
« on: March 01, 2012, 09:29:48 AM »
Hello,

I have been looking at some macro extension tubes, you know, the empty tubes you
put between your body and your macro lens, to get an even bigger magnification.
Has anyone used these, what are the advantages and disadvantages.
I saw there are 2 kinds, cheap, were you have no lock on the tubes, they just slide in to each other
or the more expensive kind, where you have a metal alpha coupling.
Your thoughts please and maybe some examples

Didi
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Offline Jumeirah

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Re: macro extender rings
« Reply #1 on: March 01, 2012, 11:06:04 AM »
good post. i always wanted to know more about them. See them around on our local stores for cheap price.

i came across this link a while back. Some pros and cons mentioned.

http://www.neilcreek.com/2007/11/10/about-macro-extension-tubes-p365-nov03/


Rui
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Offline rogprov

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Re: macro extender rings
« Reply #2 on: March 01, 2012, 11:23:00 AM »
The cheap ones are just tubes. The much more expensive ones have all the electrical connections carried through the tubes. In use the latter are far better! But, if you are intending to reverse the lens for better macros there's no point in anything other than cheap tubes (and adapters).
Roger

Offline Faldrax

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Re: macro extender rings
« Reply #3 on: March 01, 2012, 12:39:09 PM »
The cheep tubes have several disadvantages, to offset the (sometimes significant) price differential.

1) You need a camera body that allows you to take a shot with no lens attached. This may not be possible with all cameras in the range (and is pretty much a show stopper if you can't set this on your camera).
2) You have no way of setting the aperture from the camera. Some older manual lenses allow you to set aperture on them, but newer AF lenses do not - you can only shoot wide open.
3) Manual Focus only. But you are probably wanting to use MF for macro with tubes anyway, so less of an issue.

There are also tubes which have contacts but no AF drive.
These are typically about half the price of the tubes with AF, and should only have the limitation that you have to use MF.

The final point to watch for with tubes that have contacts is how many ( 5 or 8 ). Tubes with a full set of 8 contacts will work with any AF lens, tubes with only 5 contacts may not work with newer 8 pin lenses (I have not personally verified this, as I have a set with 8 pins, but this seemed to be what people were saying when I asked the difference).
« Last Edit: March 01, 2012, 02:58:23 PM by Faldrax »
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Offline KAP

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Re: macro extender rings
« Reply #4 on: March 01, 2012, 01:49:34 PM »
I use the Kenko extension tubes and they really work well and are highly recommended.
Gear:  Sony Alpha 350, 77 with a variety of Minolta and Sony lenses.