upgrading a 30D to a 7D. Anyone using the tamron 17-50 + 7D?

Started Nov 28, 2010 | Discussions thread
mangofrefav New Member • Posts: 24
Re: upgrading a 30D to a 7D. Anyone using the tamron 17-50 + 7D?

AF.

I suggest that you refer to:
http://www.canonrumors.com/forum/index.php/topic,286.0.html

if you scroll down you will see that there is a good explanation by the forum member "Neuroatomist" on the difference between line sensor and cross-type sensor.

Basically you lose the benefit of having cross-type sensors for those outer sensors, making them less sensitive.
So the AF performance with Tamron lenses on the listed Canon cameras is reduced.
Brgds

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