Canon 10D and Sigma 17-35 2.8-4.0 EX HSM

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Ride-A-Lot - 27 Dec 2003 04:43 GMT

Maybe I'm missing something or just not smart enough to figure it out.
Shouldn't I be able to set the aperture to 2.8? I can never get it to go
less than 4.0 in manual mode. Anyone else get this to work? Some tips
please.

Thanks.

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David J. Littleboy - 27 Dec 2003 05:02 GMT

> Maybe I'm missing something or just not smart enough to figure it out.
> Shouldn't I be able to set the aperture to 2.8? I can never get it to go
> less than 4.0 in manual mode. Anyone else get this to work? Some tips
> please.

Are you zoomed out to the wide end? If not, do so and try again. If you are,
appologies for the noise.

David J. Littleboy
Tokyo, Japan

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Ride-A-Lot - 27 Dec 2003 12:19 GMT

>> Maybe I'm missing something or just not smart enough to figure it
>> out. Shouldn't I be able to set the aperture to 2.8? I can never
[quoted text clipped - 6 lines]
> David J. Littleboy
> Tokyo, Japan

That was it! Thanks.

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Mark M - 27 Dec 2003 09:01 GMT

You have a variable max aperture lens (the reason it's called..."2.8-4.0,
rather than just 2.8).
This means it's max aperture shrinks to 4.0 at the longer end of the zoom
(near 35mm).
If it won't allow 2.8 at the wide end, then you've got a problem.

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John Smith - 29 Dec 2003 13:55 GMT

It is only f2.8 when the zoom is set to 17mm! At anything greater than
17mm it's widest aperture is f/4.0. This is what is called a variable
aperture zoom. Widest aperture varies based on where you have it zoomed.

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