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Old Mar 1, 2006, 4:15 PM   #1
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wondering how it compares to the Canon 100-400 f4L IS USM. i knowit gives away a couple of stops- f4.5-5.6, as opposed to f4 constant, but it's also $400 cheaper. how's the AF speed? i've heard it's a bit slow, but what's "slow"? compared to my FZ20, i imagine any DSLR AF will be very fast..
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Old Mar 1, 2006, 5:03 PM   #2
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The 100-400L is also f5.6 on long end so they both same in that respect. The problem with Sigma is that it does not have HSM which is sigma's equivalent to canon's USM. From what I know there is big difference in AF speed of a lens with USM vs no USM but I have not used any non USM lens except my 50mm f1.8 prime. yes the AF will be much better than the FZ20 but once you adjust to the faster AF of the dSLR, you will start to compalin about slow focussing lens (note, I have no personal experience with 80-400 OS).

You may want to *****h on dpreview.com->canon lens forum.
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Old Mar 1, 2006, 5:05 PM   #3
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maybe NHL can shed some more light. He has lot mre experience with Sigma glass.
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Old Mar 1, 2006, 7:39 PM   #4
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I have the 100-400 f/5.6 L IS USM so I'm also biais toward the Canon

IMHO if you're into $ saving then I would recommend the Sigma 100-300 f/4 EX instead:
1. You practically get a prime with a constant f/4
2. It makes owning a 70-200 f/2.8 (or f/4) less essential
3. This lens comes with HSM instead and it's one of the best lenses Sigma makes
4. With a 1.4x TC it becomes a decent 400mm f/5.6

You don't get to play with IS/OS, but you already know what I think about this feature... :blah:


This is my experience with birdings: theses winged animals like to be on trees... So I usually have to point my camera up, and guess where the sky is (your light source)? If I'm lucky enough to have a thick canopy to prevent any backlit from filtering through the leaves, then my photos will mostly be lacking contrast/color, or both!

-> An external flash is usually my best friend and help to secure my images with adequate lighting. I'm quite sure the birds wouldn't mind and I don't have to compromise with IS :lol: :-) :G

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Old Mar 2, 2006, 12:13 PM   #5
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I have the Sigma 80-400 OS and highly recommend it. I use it at marching band competitions so I am shooting moving targets (so to speak) and have not had any issues with the focus speed. To me it has the same focusing speed as my next closest lens the Cano EF 75-300mm IS.

The Sigma OS works very well an allows me to shoot hand held shots.

That's my experience, whether or not it would be a good lens for bird photography I could not say but for moving humans it's great.




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Old Mar 6, 2006, 3:51 PM   #6
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Here is something I just read from the other forum.

style="BACKGROUND-COLOR: #000000""I have the Sigma 80-400; save up and get the Canon 100-400. The focus speed of the Sigma will frustrate you. The push-pull zoom on the Canon actually makes more sense than the traditional ring on the Sigma (you don't have to reposition your hand during the zoom). The optical quality of the Canon is a bit better than the Sigma too IMO. Pick the Canon zoom over the prime because they both have equivalent IQ."
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Old Mar 6, 2006, 4:27 PM   #7
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bobbyz

I have a problem with the 100-400L - Most of my push-pull zooms zoom-in when you pull the barrel in toward you

This 100-400L is reverse in operation - one has to push it out to get closer (not intuitive at all)!!! :-) :lol: :G
-> I would think the Sigma is better in this regard in that both the focus and zoom ring stayed in 1 place so that one does not have to move one's hand about... (works for the 70-200 f/2.8 )
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Old Mar 6, 2006, 4:43 PM   #8
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NHL - Don't know which other push-pull zooms you talking about, but for me, the way 100-400 works is right. You need more focal lenth, you need to make the lens bigger. Much faster to zoom in/out when shooting action.

Twist zooms are nice for smaller lenses. I don't know how people zoom in/out from 50mm to 500mm on the Bigma. How does one hold the lens barrel when twisting the zoom? On 100-400L, I just have the lens barrel rest on my left palm and I just slide in & out to zoom out/in.
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Old Mar 6, 2006, 10:27 PM   #9
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bobbyz

It's been a while since they made One-touch zoom, but in the old day of manual focus lenses, both Canon and Nikon zoom-in when you pull the barrel toward the camera

Nikon: Canon:


Quote:
How does one hold the lens barrel when twisting the zoom?
You would support the lens on the palm of your hand while the fingers do the turning, very much like on the 70-200 f/2.8 -> your arm do not have to pump in-or out!

Actually on the 100-300 f/4 or 120-300 f/2.8 EX because of their internal zooming the lenght of the lens stayed constant so there's no shift in weight either (whereas on the 100-400 the weight is loaded to the front)! :?
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