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Extender for 70-300 L IS

Started Apr 6, 2012 | Discussions thread
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Re: Extender for 70-300 L IS
In reply to Brian Wadie, Apr 13, 2012

Brian Wadie wrote:

WilbaW wrote:

I'm not sure the accuracy is reliable. (For instance, it doesn't seem to be with targets that are smaller than the scope of the AF point, like distant birds. I need to do some more testing on that.)

I would have thought thatt this is more or less to be expected, even with the bare lens? (but I do agree with your points, less of a problem with the 5Dmk2 I'm finding)

I know what you mean, I just have a hunch that it's a touch worse with the TC.

So my principle is, use it only when I'm genuinely focal length limited, preferrably with CD AF, or with an outer point if Live View isn't practical. Within those constraints I'm happy with the results

I agree with this, although I am becoming much more confident about using the TC with the 5Dmk2 and tend to keep it on a lot of the time now

I'm glad to hear that. It encourages me to keep trying.

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