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PostPosted: Wed May 11, 2011 11:16 am 
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What is a 70-200mm on a cropped camera?

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PostPosted: Wed May 11, 2011 12:14 pm 
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Still a 70-200mm. It never changed.

Unless you're talking about 35mm equivalent field of views, where you multiply both by 1.6x but that doesn't mean anything unless you have a reason for it to.

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PostPosted: Wed May 11, 2011 1:15 pm 
To add to what Popo said,

A 500D with a 70-200mm lens on it has the same field of view as a 5D with a 110-320mm lens on it.

However the depth of field is not the same. It gets complicated to explain, but basically there is always going to be more in focus on a the 500D


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PostPosted: Wed May 11, 2011 2:09 pm 
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On a Canon, multiply by 1.6x for the crop factor of any lens. On a Nikon, Sony, or Pentax, multiply by 1.5x.

As others mentioned, it's not changing the actual focal length - it's basically 'cropping' the view. But the above will let you know what the equivalent view is on APS-C cameras for any lenses you attach.

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PostPosted: Tue May 17, 2011 9:10 pm 
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this will help you

www.usa.canon.com/app/pdf/lens/EFLensChart.pdf

it has all that numbers for fullframe, aps-c and aps-h, quite useful document.

I highly reccomend it!

basically, if that would be ef-s lens, it would have name like 110-320mm L ..., adn you will see further away than someone with FF sensor

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PostPosted: Wed May 18, 2011 11:31 am 
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... "basically, if that would be ef-s lens, it would have name like 110-320mm L"

This is wrong and this mis-information is confusing people.

All lenses whether Canon EF, EF-s or Sigma/Tamron are marked with their actual focal lengths.

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