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Lens for Canon 40D 
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Although I concur with the suggestions to try the Sigma 10-20, you will not get a general purpose lens much below the 16mm mark. I borrow both the Siggy 10-20 and the Canon 10-22 and prefer the Canon for indoor and the Siggy for outdoor. This is due to the autofocus prob Heather suggested. It may be worth looking at a pre-owned Siggy and the Canon 18-55mm from WarehouseExpress for £150.

Al

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Thu May 06, 2010 9:10 am
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HeatherKay wrote:
.....I wonder why Canon don't quote the real APS-C focal lengths on the lenses as opposed to the 35mm figure. Seems odd, and has royally confused me from day one.


At the end of the day, AFAIK, the focal length of a lens is EXACTLY the same, no matter what the size of the sensor is. A 50mm lense is a 50mm lens on a 35mm or full frame camera, but while it is a standard lens on a 35mm camera, it is a telephoto lens on a APSC camera.

It might be nice to have the 35mm equivalent printed printed on a Canon EF-S lens, for example, but if you moved from 35mm to medium format, would you expect the same information on a medium format camera lens?

At the end of the day, doing the math isn't that hard.

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Tue Jun 08, 2010 12:39 pm
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Some Canon lenses had a focal length equivalence printed on them as did (or do) some Olympus ones. For example , my 70-300mm has had a sticker added next to the original information that says 140-600mm as 4/3 is twice rather than 1.6 x.


Tue Jun 08, 2010 1:03 pm
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