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PostPosted: Mon Feb 25, 2008 7:24 pm 
Sigma 18-200 DC OS + 1.4x / 2x / 3x TC = Is it possible??

I have a Sigma 18-200 DC OS for my EOS 400D, I'm just wondering if I can use a TELE CONVERTER (TC) to double or triple my focal length...?

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PostPosted: Mon Feb 25, 2008 7:37 pm 
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Joined: Sun Nov 05, 2006 11:08 pm
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Location: Germany
Hello mac_ares, and welcome to friendly Camera Labs forum!
If you love IQ ("image quality" that is), you better not even try a 1.4x converter on that lens. It is also quite probable that the 400D-AF has difficulty to focus as you lose 1 stop on the 1.4x and 2 stops on the 2.0x converter.

Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D810+assorted lenses

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PostPosted: Tue Feb 26, 2008 2:07 pm 
No. I would not recommend you tried a teleconverter with the 18-200 OS.

If in doubt, always consult your lens manufacturer. This is what they have to say:

It's not on the compatible list.

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