Whats the difference

Tighearnach · Jan 7, 2008

Sigma 10-20mm f4-5.6 EX DC HSM - Canon fit lens 285 pound sterling
Sigma 12-24mm f4.5-5.6 EX DG HSM Zoom Lens For Canon Digital & Film Cameras 402pound sterling

Can someone set me straight on what my extra money is getting me. Is the first lens for cameras with a smaller sensor? I use an XTI.

Thanks a mill
T

Mav · Jan 7, 2008

The 12-24 is a full-frame 35mm lens whereas the 10-20 is designed for the 1.5/1.6x cropped bodies and won't work at all on a full frame DSLR (1Ds/5D) or 35mm film bodies.

10mm on a crop body is only equivalent to about 15/16mm in full 35mm terms, so a 12mm on a full-frame body will still be wider and have larger angle of view than 10mm on a crop body.

Does that make sense? lol

Tighearnach · Jan 7, 2008

Thanks Mav had a feeling that was the case. Do you know if Canon have a similar lens made specifically for the cropped sensor?

Antithesis · Jan 7, 2008

I believe the sigma that you were looking at is the widest wide-angle you can get (other than a fish, but most people don't want that severe of distortion).

Mav · Jan 7, 2008

Tighearnach said:
Thanks Mav had a feeling that was the case. Do you know if Canon have a similar lens made specifically for the cropped sensor?

Canon has the EF-S 10-22mm which is supposed to be an excellent lens from what I've heard, and around $600 USD. It's a better lens than the Nikkor 12-24 f/4 which is over $1000! :grumpy:

nicfargo · Jan 7, 2008

All of Canon's EF-S lenses are for cropped bodies only. What do you shoot with?

Mav · Jan 7, 2008

first post = XTi

nicfargo · Jan 7, 2008

thanks Mav, I really need to learn to read better.

RyanLilly · Jan 7, 2008

nicfargo said:
All of Canon's EF-S lenses are for cropped bodies only. What do you shoot with?

I think that its worthwhile to note that EF-S are designed for 1.6 crop bodies except the 10D the 1d series have a 1.3x crop, I believe however, that the 1D/s MK III can use EF-S lenses but it utilizes a smaller portion of the sensor, I do not think that the MK I/II can use EF-S.

So, Current EF-S Compatibility line up- XT, XTI, 20D, 30D, 40D

Joves · Jan 7, 2008

Mav said:
Canon has the EF-S 10-22mm which is supposed to be an excellent lens from what I've heard, and around $600 USD. It's a better lens than the Nikkor 12-24 f/4 which is over $1000!

And you know the 12-24 is a lesser lense why now? Is it because you have one or, shot with one? Im just curious as to where you came to your conclusion.

Mav · Jan 7, 2008

RyanLilly said:
I think that its worthwhile to note that EF-S are designed for 1.6 crop bodies except the 10D the 1d series have a 1.3x crop, I believe however, that the 1D/s MK III can use EF-S lenses but it utilizes a smaller portion of the sensor, I do not think that the MK I/II can use EF-S.

So, Current EF-S Compatibility line up- XT, XTI, 20D, 30D, 40D

The 10D is a 1.6x also.

Mav · Jan 7, 2008

Joves said:
And you know the 12-24 is a lesser lense why now? Is it because you have one or, shot with one? Im just curious as to where you came to your conclusion.

Because a certain well known Nikon shooter whose name I shall not mention who also reviewed the Canon mentioned that a) it's a lot wider, b) has far less distortion than any other crop factor wide angle zoom on the market including the Nikon, c) it's a lot cheaper and actually affordable, and d) the lens made him want to seriously switch to Canon