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Old Jan 3, 2008, 8:49 PM   #1
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Can someone tell me why there is such a big price difference between these two lenses. Canon 24-105mm f/4L IS USM and Canon 28-135 f/3-5.6 IS USM. Both are IS USM and wide angle. Also, what does the L in f/4L stands for and the other one does not have the L as in f/3.5.

Why does the 24-105 only says f/4L but the other one says f/3-5.6? Can't the 24-105 shoot at 5.6 also? Why does the 24-105 not specify through like in f/3-5.6?
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Old Jan 3, 2008, 11:20 PM   #2
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L stands for "luxury" according to the EF Lens Work book from Canon...

calitran wrote:
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Can someone tell me why there is such a big price difference between these two lenses. Canon 24-105mm f/4L IS USM and Canon 28-135 f/3-5.6 IS USM. Both are IS USM and wide angle.
The 24-105 is of higher quality i.e. it does wobble like the polycarbonate made 28-135, and it's also a constant aperture (the aperture does not change as one zoom in or out) which is fixed @ f/4

-> The 28-135 on the other hand is f/3.5 @ 28mm, but slow down to f/5.6 @ 135 - i.e. the aperture become smaller as you zoom in... since there's no correcting elements for this the lens, it is simpler to make than a constant aperture zoom like the 24-105 hence cheaper



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Can't the 24-105 shoot at 5.6 also?
Off couse it can
-> The lens nomenclature only list its widest opening which is f/4, it can close down to f/5.6, f/8 etc... which is controlled by the camera
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Old Jan 3, 2008, 11:28 PM   #3
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24-105 f4 means it will have a constant f4 aperture throughout its zoom range. It will do f5.6 and smaller. The f number published is the largest aperture the lens has. 28-135 f3.5-5.6 means it is f3.5 at 28mm and goes to f5.6 at 135mm. The lens goes "slower" as you zoom from 28mm to 135mm. That would change your exposure.
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Old Jan 4, 2008, 12:01 AM   #4
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NHL, when you say "but slow down to f/[email protected]" I understand the aperture becomes smaller but does slow down mean it takes longer for the aperture to close upon taking a shot? What does slow down mean? does it just mean the aperture gets smaller?
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Old Jan 4, 2008, 8:34 AM   #5
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calitran wrote:
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What does slow down mean? does it just mean the aperture gets smaller?
Yes - that's what it means. The term 'slow' refers to the fact that as the aperture closes down the shutter speed willl slow down with it. You'll hear the term "fast lens" - that usually means a lens with a wide aperture (2.8, 2.0, 1.8, 1.4 etc.)

Also, for what it's worth I used the 28-135 as my walk-around lens for 4 years. A couple months back I replaced it with the 24-105.

Build quality is definitely better. No wobble with the 24-105 even though both lenses are telescoping (i.e. as you zoom the barrel of the lens actually extends).

Image quality is DEFINITELY better. The 28-135 was a great lens for what it was and I was very happy with it. But I didn't often get what I call the 'WOW' factor out of my shots strait out of the camera with the lens. They weren't poor quality at all - they were GOOD. The shots out of camera with the 24-105 are GREAT. Even at f4.0 (typically you have to close a lens down to get sharp images).

The 28-135 is probably one of the best non-L lenses in Canon's lineup. It really is a good workhorse lens. But these two lenses demonstrate what L lenses are supposed to deliver. While the 28-135 produces good to very good results the 24-105 delivers GREAT results. Not just sharpness, but pop and color as well and good bokeh (quality of background blur) for what it is (i.e. you can't expect the bokeh to be as good as a 300mm 2.8). All of which means the images I take with this lens require less work to look great than images taken with the 28-135.

But, I would also caution: presumably you're considering this lens for one of Canon's 1.6 crop cameras (40d, 30d, XT, XTi). If that's the case, 24mm behaves like 38mm on a film camera (i.e 24 x 1.6 = 38.4). That isn't incredibly wide. On a full-frame camera like the 1ds or 5d it still behaves like 24mm and is thus wide. But not so much on a 1.6 crop camera. So, before investing $1000 in the 24-105 you want to be sure the focal length is right for your style of photography.

For me it is. But I also have a 17-40 lens for when I do need true wide angle - and I'm also using a 1.3x crop camera so the 24mm behaves like a 31mm lens which is a decent enough wide angle to use for many situations.
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Old Jan 4, 2008, 3:05 PM   #6
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For me it is. But I also have a 17-40 lens for when I do need true wide angle - and I'm also using a 1.3x crop camera so the 24mm behaves like a 31mm lens which is a decent enough wide angle to use for many situations.

Thats one reason why i decided to keep my 12-24 along with the 24-105 when i got the mark III. 24-105 stays almost for ever in the camera and it looks smaller on this set up when compared to a 5D(For obvious reasons)

The 12-24 is absolutely great on the mark III. In fact it was great on my 5D. Some shots and perspectives were really great with that lens. Super sharp wide open at the centre too.

this one with the 5D at 12mm...i somehow cant get over this lens...
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Old Feb 4, 2008, 12:47 PM   #7
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As another 24-105 user with my 5D I can agree that it's a lovely lens, and sometimes I put it on my 30D but it is not wide enough for a lot of uses as said. If you are looking for a high quality walk around lens then for the same price then 17-55mm f2.8 IS USM is a great choice (assuming you have a crop camera). If you are a 5D or 1D user then the 24-105 is the way to go.
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