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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 16 Apr 2013 (Tuesday) 09:08
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Hack dumb extension tubes to be smart?

 
SmokeySiFy
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Apr 16, 2013 09:08 |  #1

Hey all, I just ordered a set of fotodiox extension tubes and they should come today. I was wondering if it would be simple to use like a ribbon connector from a computer and upgrade them to smart tubes. I have have access to a drill press and basic workshop.


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ZoneV
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Apr 16, 2013 09:13 |  #2

I have done that - for my 6mm thin Canon EF extension tube (external link).

I did this with a plastic block and some metal bolts. But this way is not simple, I need to make some improvements to have it for easy use.

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SkipD
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Apr 16, 2013 09:34 |  #3

ZoneV wrote in post #15833568 (external link)
I have done that - for my 6mm thin Canon EF extension tube (external link).

I did this with a plastic block and some metal bolts. But this way is not simple, I need to make some improvements to have it for easy use.

QUOTED IMAGE

Be careful with this sort of mod as it could easily ruin the gold-plated connectors in the camera.

The connectors in lenses or properly built extension tubes are smooth gold-plated connectors with little springs behind them for proper contact tension.


Skip Douglas
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ZoneV
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Apr 16, 2013 10:04 |  #4

SkipD wrote in post #15833627 (external link)
...The connectors in lenses or properly built extension tubes are smooth gold-plated connectors with little springs behind them for proper contact tension.

As writen above this is not the end result. The bolts need to have rounded edges.
In my very well working extension tubes (not Canon or Kenko, naming rubbed off after several years) there are no springs, and no gold plating.
I think the Kenko 11 or 12 mm one is not very different.
But as said, the connector bolts need to get a better smoother finish.


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amfoto1
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Apr 16, 2013 10:30 |  #5

Seriously? Do you think you can mod the dumb tubes for less than the $45-60 (external link) or (depending upon the quality level) $70-90 (external link) cost of a set of the smart tubes?


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ZoneV
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Apr 16, 2013 10:52 |  #6

amfoto1 wrote in post #15833785 (external link)
Seriously? Do you think you can mod the dumb tubes for less than the $45-60 (external link) or (depending upon the quality level) $70-90 (external link) cost of a set of the smart tubes?

Depends how he calculate his own work.
Material should be relative cheap. As a student I would have thought about it.

But I suggest one or two cheap old film camera and cheap EF lenses for the tests!


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Hack dumb extension tubes to be smart?
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