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Canon EOS Crop Sensor for HD
APS-C sensor cameras including the 80D, 70D, 7D Mk. II, 7D, EOS M and Rebel models for HD video recording.

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Old June 22nd, 2011, 04:28 AM   #1
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Join Date: Jan 2011
Location: Wylam
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2x converter

I will be traveling in the summer and have bought a Sigma 18-250 which I use on my 7D, I know its far from the best lens but it suits my needs well. Traveling light is a priority and the 18-250 gives me a good compromise between traveling light and image quality v affordability.

Im thinking about a 2x converter as I may need to film video from a distance. I have looked at this one.

Sigma DG tele-converters: Digital Photography Review

At 500mm will my IS and AF still work and do you guys think it will provide decent results?

Many thanks
Alan Maughan is offline   Reply With Quote
Old June 22nd, 2011, 04:10 PM   #2
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Re: 2x converter

With that setup and a 2x converter, AF and IS won't work, the image will be very soft, low in contrast and chromatic aberrations may be quite bad.

A T3i would be a much better solution with it's 3x video crop mode. That's why I picked one up along with my 7D.
Kin Lau is offline   Reply With Quote
Old June 28th, 2011, 11:13 PM   #3
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Re: 2x converter

Kenko is what you want - its the factory version of the Tamron and maybe one or two others. my review of the 1.4X is here Kenko 1.4X Teleconverter Review . if the lens is a 4.5, then at about F8 1/2 ( 9.5) thats well past what the AF system will do.

if you want a LONG lens, try a Vivitar ( made by tokina ) 400mm 5.6 : review here Vivitar 400mm 5.6 Lens Review & Video : UPDATED which you can pick up on ebay for around $100 or so. it is heavy, but its a nice piece of glass, especially for the price. while you won't get AF, you may get AF confirm with a programmable adapter.
Steve Oakley
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