Can anyone explain this?

Started Mar 20, 2012 | Discussions thread
Arky
Regular MemberPosts: 425Gear list
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Re: Didn't work :(
In reply to LUIS A GUEVARA, Apr 5, 2012

It is excellent that you mentioned that, because that Life Size Converter is in no way different than the 2x except that its optical elements are Optimized for Macro while the 2x is optimized for distant shots.

So we have 3 different Jumper configurations that could be tested easily by someone with a Merrill and a steady hand , able to wrap some thin wire around those last 3 contacts and do some testing with a manual lens .

Luis

I'm not following your rationale here. The camera will not see the bare TC at all. It will trip the mechanical lens detection switch but will not deliver any electronic signal to the camera. It's exactly the same as tripping the switch manually.

The TC detection pins communicate with the lens only, they are invisible to the camera. A TC aware SA lens detects the TC and modifies the focal length and max aperture reported to the camera.

A manual lens doesn't see the TC detection pins and doesn't communicate with the camera anyway. The only thing a TC would accomplish is to trip and hold the mechanical lens detection switch during a lens change.

Also, I would imagine very few manual lenses can even be mounted on the Sigma TC due to the protruding front optics.
-Jerry

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