jorge1812
Posts: 2911
Joined: Mon Apr 19, 2004 9:11 pm

Question About Canon EF-S 18-55 Lens

Tue Mar 07, 2006 11:02 pm

Hi.
As some here might know I bought a Canon EOS 350D last week with the EF-S 18-55 kit lens. Today I got told due to the fact EF-S lens there is no (how is it called) factor of 1,6. Is this true? Does it really use the true 18-55mm and not as I thought 28,8-88mm. Any help is welcome.
Thanks.
Georg
 
RuudOnline
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RE: Question About Canon EF-S 18-55 Lens

Tue Mar 07, 2006 11:17 pm

It acts as 28-88mm lens. The "S" in EF-S stands for "Short back focus".

Ruud
 
jorge1812
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RE: Question About Canon EF-S 18-55 Lens

Wed Mar 08, 2006 12:36 am

Quoting RuudOnline (Reply 1):

Thanks. I thought so. Will tell my friend that he told me the wrong thing.

Georg
 
jumbojim747
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RE: Question About Canon EF-S 18-55 Lens

Wed Mar 08, 2006 5:17 am

Quoting Jorge1812 (Thread starter):
there is no (how is it called) factor of 1,6. Is this true?

The crop factor has nothing to do with the lens .
The crop factor is an in camera sensor feature and not a lens feature
Cheers
On a wing and a prayer
 
jorge1812
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RE: Question About Canon EF-S 18-55 Lens

Wed Mar 08, 2006 7:22 am

Quoting JumboJim747 (Reply 3):
The crop factor is an in camera sensor feature and not a lens feature

That's what I thought but I got told the other way today. Now I know better!

Thanks!

Georg
 
sllevin
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RE: Question About Canon EF-S 18-55 Lens

Wed Mar 08, 2006 8:22 am

An EF-S lens eliminates the crop issue. An 18-55 EF-S lens will function as an 18-55.

You get the crop issue when you mount EF lenses on your camera.

I'm not arguing that full sensor (like the 5D) DSLR's are the wave of the future and EF-S will likely pass on with age. But it DOES fill the same purpose by allowing you to hit the full sensor.

Steve
 
Staffan
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RE: Question About Canon EF-S 18-55 Lens

Wed Mar 08, 2006 4:19 pm

Quoting Sllevin (Reply 5):
An EF-S lens eliminates the crop issue. An 18-55 EF-S lens will function as an 18-55.

You get the crop issue when you mount EF lenses on your camera.

Wrong. Read above.

Quoting RuudOnline (Reply 1):
It acts as 28-88mm lens. The "S" in EF-S stands for "Short back focus".



Quoting JumboJim747 (Reply 3):
The crop factor has nothing to do with the lens .
The crop factor is an in camera sensor feature and not a lens feature
 
jorge1812
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RE: Question About Canon EF-S 18-55 Lens

Wed Mar 08, 2006 7:35 pm

Searched the Canon Website and found that

The EF-S 18-55mm f/3.5-5.6 is a standard zoom lens specifically designed for the EOS 300D digital SLR. Its effective focal length is equivalent to 29-88mm in 35mm film format.

29-88mm is true so the crop factor works on this one too.

http://www.canon-europe.com/For_Home...onentID=52477&SourcePageID=26341#1

Georg
 
sean377
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RE: Question About Canon EF-S 18-55 Lens

Thu Mar 09, 2006 5:33 am

Until we are told otherwise (by the manufacturers), all SLR lens focal lengths are quoted in the 35mm full frame format, as most above have correctly stated.
Flying is the second greatest thrill known to man... Landing is the first!
 
Kukkudrill
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RE: Question About Canon EF-S 18-55 Lens

Thu Mar 09, 2006 7:41 am

Quoting Sean377 (Reply 8):
Until we are told otherwise (by the manufacturers), all SLR lens focal lengths are quoted in the 35mm full frame format

Lens focal length has nothing to do with sensor/frame size and won't change if you mount the lens on a camera with a smaller sensor. The only thing that would change is the image perspective produced by the smaller sensor, and this is what the crop factor is meant to indicate. My old Olympus C-740 has a focal length of 6.3 to 63mm which is quoted as equivalent to 38-380mm on a 35mm camera because the Olympus has such a tiny sensor, but supposing I could somehow detach the lens and mount it on a 35mm SLR the focal length would remain 6.3-63mm.
Make the most of the available light ... a lesson of photography that applies to life
 
sean377
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RE: Question About Canon EF-S 18-55 Lens

Thu Mar 09, 2006 4:13 pm

Quoting Kukkudrill (Reply 9):
Lens focal length has nothing to do with sensor/frame size and won't change if you mount the lens on a camera with a smaller sensor. The only thing that would change is the image perspective produced by the smaller sensor, and this is what the crop factor is meant to indicate. My old Olympus C-740 has a focal length of 6.3 to 63mm which is quoted as equivalent to 38-380mm on a 35mm camera because the Olympus has such a tiny sensor, but supposing I could somehow detach the lens and mount it on a 35mm SLR the focal length would remain 6.3-63mm.

That's why I specifically said SLR lenses.
Flying is the second greatest thrill known to man... Landing is the first!
 
Kukkudrill
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RE: Question About Canon EF-S 18-55 Lens

Fri Mar 10, 2006 2:04 am

I understood you as implying that the lens focal length varies depending on the sensor format, which is not the case either for DSLRs or compacts.  Smile
Make the most of the available light ... a lesson of photography that applies to life
 
Staffan
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RE: Question About Canon EF-S 18-55 Lens

Fri Mar 10, 2006 2:32 am

Quoting Sean377 (Reply 8):
Until we are told otherwise (by the manufacturers), all SLR lens focal lengths are quoted in the 35mm full frame format, as most above have correctly stated.

No, their real focal length is what's marked. As said, it has nothing to do with 35mm full frame, 1.6 crop or medium format.
 
sean377
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RE: Question About Canon EF-S 18-55 Lens

Fri Mar 10, 2006 4:16 am

Chaps, I'm agreeing with you here, but we are mis-understanding each other.

I was responding to the original posters question when he was uncertain whether or not the focal length/range of EF-S lenses are adjusted and quoted specifically for the cameras for which they are made.

Or put simply, an EF-S 18-55mm would give the same field of view as an EF 18-55mm (if there was one available) when mounted on a 350D, i.e. the EF-S 18-55mm is not relabelled an EF-S 28-90mm, which I think was the original question!

Phew! Complicated or what?

Sean
Flying is the second greatest thrill known to man... Landing is the first!
 
martinairyyz
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RE: Question About Canon EF-S 18-55 Lens

Fri Mar 10, 2006 12:05 pm

It doesn't stay as an 18-55.... it is multipled by 1.6x due to the size of the camera sensor, not dependant on the lens itself.

Overall it is a nice lens for beginners, and provides a good zoom range for everyday shooting  Smile

Martin
Chelsea Football Club supporter.
 
mattbna
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RE: Question About Canon EF-S 18-55 Lens

Sun Mar 12, 2006 12:33 pm

Quoting Jorge1812 (Reply 7):
The EF-S 18-55mm f/3.5-5.6 is a standard zoom lens specifically designed for the EOS 300D digital SLR.

...and will work on the 350D and the 20D as well.

I was actually surprised to see that Canon made the excellent 10-22mm an EF-S lens - eliminating the possibility of putting it on the 5D or even the good 'ole 10D.

I have had the 18-55mm lens for almost 2 years now and actually love the little thing... I wish the kit version of the lens was the USM model but you can't have it all when it is that cheap!  Smile


Matt
Canon EOS 7D & 40D -- 100-400mm L IS -- 70-200mm f/2.8L IS II -- 28-135mm IS -- 10-22mm -- 18-55mm EF-S
 
dc10tim
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RE: Question About Canon EF-S 18-55 Lens

Sun Mar 12, 2006 10:15 pm

Quoting Mattbna (Reply 15):
I have had the 18-55mm lens for almost 2 years now and actually love the little thing...

I don't know why it seems to get such a bad press. Personally I think it's a great little lens and have taken some lovely shots with it.

Tim.
Obviously missing something....
 
sulman
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RE: Question About Canon EF-S 18-55 Lens

Sun Mar 12, 2006 10:38 pm

Quoting DC10Tim (Reply 16):
I don't know why it seems to get such a bad press. Personally I think it's a great little lens and have taken some lovely shots with it.

Because it's cheap. As you say, there's nothing wrong with it - you can get terrific results.
It takes a big man to admit they are wrong, and I am not a big man.

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