April 16, 2014, 10:02:27 AM

Author Topic: Sigma Macro 180mm f2.8 OS Canon TC modification  (Read 890 times)

Jappe

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Sigma Macro 180mm f2.8 OS Canon TC modification
« on: July 18, 2013, 09:23:31 AM »
I just bought Sigma Macro 180mm F2.8 EX DG OS HSM and I noticed that Canon TC's cannot be used with it. Looks that Sigma has just added additional (too long) collar behind the rear lens. That collar will prevent use of Canon TC's. If collar would be just 1-2 mm shorter Canon TC's could be used.

Has anyone tried to cut that collar little bit shorter? I removed bayonet of the Sigma but I couldn't figure out how that collar is mounted. Maybe it has only threads that will keep it around the rear lens mount. That collar seems to be made of plastic so I believe that it is not the actual mount for the rear lens.

Surely modification can void warranty, but lets not care about that  ;D

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Sigma Macro 180mm f2.8 OS Canon TC modification
« on: July 18, 2013, 09:23:31 AM »

Jappe

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #1 on: July 22, 2013, 02:31:17 PM »
I tried to modify Sigma, but it was not working easily.  :-X

I decided to see if TC could be modified...

I removed rubber collar from Canon TC's outer most lens and I cut outer lens holder tube 0,5mm shorter. Now Canon TC fits to Sigma 180 mm OS macro and it works with it perfectly.  :D

chrysoberyl

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #2 on: March 31, 2014, 02:24:59 PM »
I just got a Sigma 180mm 2.8 and my Canon 2X TC III does not fit.  Is that the same TC you modified?  Does it AF with the 2X TC?  How did you cut the tube?

johnf3f

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #3 on: March 31, 2014, 06:40:31 PM »
I modified a cheap extension tube to allow the use of extenders on any Canon EOS mount lens. It completely eliminates the problem of the lens rear elements fouling the front element of the extender. You will loose infinty focus but that is hardly a problem on a Macro lens!
For reference the extension tube is 13mm long. If you look at the one on the right you can see that I modified the anti reflection screen with a Stanley Knife. Cheap - simple and it works!

chrysoberyl

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #4 on: April 01, 2014, 08:23:24 AM »
Thanks, Johnf3f, I have gone that route with the Canon 12mm extension tube, but infinity focus and AF are lost.  I want the flexibility of going from macro to tele without fiddling.  I like what Jappe did, but before a start modifying, I would like to know whether the Sigma 180 2.8 + Canon TC III combination will AF.

johnf3f

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #5 on: April 01, 2014, 07:27:58 PM »
Thanks, Johnf3f, I have gone that route with the Canon 12mm extension tube, but infinity focus and AF are lost.  I want the flexibility of going from macro to tele without fiddling.  I like what Jappe did, but before a start modifying, I would like to know whether the Sigma 180 2.8 + Canon TC III combination will AF.

Don't understand why you lost AF! The extension tube should just relay the electrical signals and no functionality should be lost, though infinity focus would go.
I am afraid there is no solution other than modifying your lens/extender at your own risk! Though you could try the old Kenko 1.5 (Note 1.5 not 1.4) extender which will work with any lens - but the IQ is not great though they were only 50 quid brand new. I found cropping was better.
A far better (though more expensive) solution would be to get a used Canon 300 F4 L IS or a Canon 400 F5.6 L - pricey but very good!

chrysoberyl

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #6 on: April 15, 2014, 07:08:02 AM »
Update: I returned the lens as it fit loosely on my Canon 6D.    Before doing so, however, I purchased a Sigma 1.4X TC and am very pleased with the results.  BTW, the TC fit snugly on my 6D, as does my Sigma 85mm f/1.4.

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #6 on: April 15, 2014, 07:08:02 AM »

mackguyver

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #7 on: April 15, 2014, 03:22:06 PM »
Have any of you compared the Sigma to the Canon 180L?  I'm curious about how they compare (beyond the obvious spec differences).
EOS M | 5D III | 1D X
EF 24 1.4L II | 50 1.2L | 85 1.2L II | 180 3.5L Macro | 300 2.8L IS II 16-35 2.8L II | 24-70 2.8L II | 70-200 2.8L IS II
TS-E 24 3.5L II :: Extender 1.4x III | 2x III :: EF-M 22 2 | 18-55mm 3.5-5.6 IS

traingineer

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #8 on: April 15, 2014, 04:02:37 PM »
Have any of you compared the Sigma to the Canon 180L?  I'm curious about how they compare (beyond the obvious spec differences).

Well the main difference is the Sigma apparently focuses faster than the Canon, it's got IS and I think it's IQ is slightly better.
7D | 24-70mm F2.8 I | 50mm F1.8 II | Sigma 105mm F2.8 OS

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Re: Sigma Macro 180mm f2.8 OS Canon TC modification
« Reply #8 on: April 15, 2014, 04:02:37 PM »