Topic Author
Posts: 1046
Joined: Thu Feb 13, 2003 1:18 pm

How Does Canon Camera Focus

Wed Apr 09, 2003 7:01 am

I have read a lot of topics on one canon lens has a faster focus than another. I am under the impression that canon lenses focus is controled by the camera. Am I right about this?

I am looking at the 10d, and I have a Sigma 170-500mm lens will it focus faster on the 10d because it has been reported that the 10d has alot faster focus than any other digatal camera.


Canon 50D user; 100-400 MM L IS 10-22 MM, 60MM Macro
Posts: 3630
Joined: Thu Oct 18, 2001 12:49 am

RE: How Does Canon Camera Focus

Wed Apr 09, 2003 7:03 am

The amount of focus adjustment is controled by the camera. It has a senser which measures the amount needed through the lens (TTL).

The lens has the motors which actually move the lense into that focus position. So it depends on the camera wether or not a point is picked, and it depends on the lens how fast it actually gets there...

Wietse de Graaf
Posts: 4586
Joined: Fri Aug 27, 2010 12:26 am

RE: How Does Canon Camera Focus

Wed Apr 09, 2003 8:15 am

10d has alot faster focus than any other digatal camera - I think that statement needs qualifying ... it is faster than the D30/D60, and probably the D100. A 1Ds or 1D will leave it standing! It is basically the same system as Canon's mid-range EOS 30.


Colin K. Work, Pixstel

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