1.4x TC mod

Started Feb 3, 2013 | Discussions thread
Arky Regular Member • Posts: 433
Re: 1.4x TC mod

yvind Strm wrote:

Antone wrote:

jrdigitalart wrote:

I do not intentionally throw this fly into your soup, guys, but with my 2 x TC connected to my 50 - 500, OS becomes inoperative.

jrdigitalart wrote:

On the Sigma SDx cameras, AF does not work when lens is connected with my 2X TC in between.

I understand you lose autofocus because of the reduced aperture size with a 2x TC on the 50-500, but why would OS also fail?

OS is always lost in these conversions, because the signals and/or cabling differ between Sigma and Canon. Its a hit with AF, AE, AA, but not OS.

Not necessarily. I have a Sigma 80-400 lens that was originally SA mount, I converted it to EF mount and the OS works fine with all my Canon bodies. Apparently Canon IS lenses do not stabilize at all with Sigma bodies when converted to SA mount though.

At any rate, I'm only doing this to a 1.4x TC with the intent of using my Canon 70-200 f/4L and 135 f/2L lenses.

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Kind regards

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