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EF vs EF-S

Len Niemyski , Feb 23, 2010; 08:53 a.m.

I'm looking to buy at least two new lenses for my EOS 40D. I know that the EF-S lenses are designed for the reduced frame size. However, what is the effect of using the EF lenses on the 40D?
Thanks

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William Kahn , Feb 23, 2010; 09:04 a.m.

Adam Gifford , Feb 23, 2010; 09:20 a.m.

the crop factor affects the EF-S lenses as well.
The main difference is that since the EF-S lenses (in general) have a reduced image circle, they can be made smaller & cheaper.
The 3rd party lens makers also make some reduced image circle lenses that don't use the ef-s mount. But if you use them on a full-frame camera you get severe vignetting.
If you want an ultrawide (10-22mm) or thereabouts you are pretty much going to be getting a reduced image circle lens of some sort.

Steve Porte , Feb 23, 2010; 09:39 a.m.

Canon makes some very good quality EF-S lenses. Any EF lens will work on APC sensor cameras (40D). EF-S lenses will ONLY work on APC bodies. If you are considering going full frame in the future, EF glass can be carried over.

Dick Arnold , Feb 23, 2010; 09:39 a.m.

I have had digital 1.6 crop factor bodies since 2002. I have stayed away from EF-s lenses because I knew ultimately I would go to full frame which I did awhile ago and all my lenses are useful. Because I kept a 1.6 crop XTi and wanted something very light weight(I get tired of dragging 3 pound L lenses around) I bought an EF-s 18-55 to go on the XTi that I kept. I used a Canon 17-40 f4L on 1.6 crop bodies for sometime. I gave me 28-62 effective focal length. I made lots of nice pictures with that combination. So if you ever want to go to full frame I would stay away, mostly, from EF-s lenses. It worked for me.

Stephen Cumblidge , Feb 23, 2010; 10:22 a.m.

EF-S lenses can be made smaller, less expensive, and often sharper than EF equivalents. You can also make some great lenses that are challenging to make for EF mounts. I really like the look of the Tamron 60mm f2 macro. I love my Tokina 50-135 2.8 (80-216 equivalent). I would much rather run around with a Sigma 50-150 2.8 than a Canon 70-200 2.8. The Tamron 17-50 (non VC) and the Canon 17-55 are both sharper and faster than the EF 17-40.

I like EF-S lenses a lot. If you get the right ones you can do very well for not a lot of money.

Tommy DiGiovanni , Feb 23, 2010; 12:14 p.m.

Find what focal lenght, aperture etc you desire or can afford and go with it. Don't worry to much about it being EF or EF-S. I tried to say away from ef-s but I found out ultimately you will probably need an EF-S lens if you have a 40D or other 1.6 crop body.
1 nice thing about EF-S is the lenses are smaller and lighter so they do have some advantages and if you go full frame simply sell them.

Puppy Face , Feb 23, 2010; 12:41 p.m.

Just buy what you like and need. If you eliminate EF-S simply because someday you might go FF you're losing out on some excellent optics. You can always sell them if you toss APS. Selling a lens is a lot faster and easier than back in the day. However, most FF shooters also use APS so these lenses could be useful longer than you think.

Gary Ertle , Feb 23, 2010; 12:42 p.m.

What is the effect of using EF lenses on 40D? They work great. I have a 40D and of the few lenses that I have only one of them is specifically designed for the crop-sensor. If nothing else these should be less susceptable to vignetting and other edge effects that might show up with EFS lenses.

David W. Griffin , Feb 23, 2010; 01:26 p.m.

Assuming you can get the EF-S lenses cheaper (and smaller) you're weighing that against the risk of you're buying a Canon Full Frame camera such as a 5D mk II and having to sell them and buy replacements for them. Only you know if this is a real possibility. And that assumes that Canon will go on selling a mix of APS and FF cameras. There is always the chance that Canon will eventually have ALL full frame cameras and that you will eventually be forced to upgrade anyway.

Of course if you never upgrade to full frame, then buying the larger, more expensive full frame lenses means you'll spend more money and have a heavier camera bag for all the time you're shooting the system. So there is no easy answer.


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