AF with my Sigma 300-800 and Sigma 50-500 and the 50D

Started Oct 1, 2008 | Discussions thread
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pauljd
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AF with my Sigma 300-800 and Sigma 50-500 and the 50D
Oct 1, 2008

Just received my 50D this afternoon and tried it out on my Sigma 300-800mm with a Canon 1.4 TC.

First it autofocused with no problem. I can only guess but it seem to lock in twice as fast as the 40D it replaced.

The AF test I did today was with very cloudy overcast conditions. If it's sunny tomorrow I will get a chance to test under normal conditions.

I also have a Sigma 50-500 which I use for close up pictures. This set up has a Kenko pro 1.4 TC however I forgot to remove the 36mm extention tube I had attached and under the same cloudy crappy conditions it actually AF OK but was slow.

With the 40D it was impossible to get AF with the above set up.

After I took the extention tube off it AF'ed OK and much faster than with the 40D.

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