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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 22 Mar 2007 (Thursday) 08:14
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Studio aperture

 
matt1987
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Mar 22, 2007 10:49 |  #16

Sounds like you have some older Sigma lens with an EOS mount.

Some may still be able to be modified by Sigma to work properly. If Sigma still has parts, they will do this modification for free. But, on many of these lenses they no longer have the needed replacement parts.

Contacy Sigma with an exact description of the affected lenses and they will inform you immediately if they can make the upgrade.

I believe some of those old Sigma lenses can be rechipped to work with current cameras. If you like it that much, you may want to check with Sigma about that.

Yea, I just sent them an email :)


// Cameras: EOS 5D, but I mostly use the Mamiya 6x7
// Website: www.sublimegraphic.com (external link) (now with a blog!)

  
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FlashZebra
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Mar 22, 2007 10:52 |  #17

Curtis N wrote in post #2912578 (external link)
I believe some of those old Sigma lenses can be rechipped to work with current cameras. If you like it that much, you may want to check with Sigma about that.

I often see this reffered to as being "rechipped" but with my discussions with Sigma this is not a very accurate description.

Typically they replace a small circuit board in the lens that contains several components. This board has to be soldered in. It is not just a chip replacement.

The underlying issues are typically firmware confusion and/or issues surrounding electrical current provided to the mechanisms for the lens (like the current required to stop down an aperture).

Enjoy! Lon


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matt1987
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Mar 22, 2007 12:59 as a reply to  @ FlashZebra's post |  #18

wow you seem to be knowing a lot about this stuff...


// Cameras: EOS 5D, but I mostly use the Mamiya 6x7
// Website: www.sublimegraphic.com (external link) (now with a blog!)

  
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FlashZebra
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Mar 22, 2007 13:53 |  #19

matt1987 wrote in post #2913183 (external link)
wow you seem to be knowing a lot about this stuff...

I know no more that what one conversation with a Sigma lens repair technician offered.

When I called Sigma they immediately linked me with a lens repair technician that offered the info I presented above.

I called about 2 years ago.

Enjoy! Lon


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matt1987
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Mar 22, 2007 14:42 |  #20

well then:

wow, you've got a good memory... :) thanks :D


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Studio aperture
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