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PostPosted: Tue Oct 26, 2010 9:07 pm 
wc one is better



canon 50d/ 24-105


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PostPosted: Tue Oct 26, 2010 9:25 pm 
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I deleted your duplicate pst in the Lens Gallery section. It not only broke that section's guidelines but we don't allow duplicate posts here at CameraLabs. Forum Rules refer. Good luck with your purchase.

Bob.

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PostPosted: Tue Oct 26, 2010 10:35 pm 
The sigma.

F2.8 allows you to do things that just wouldnt be possible with only an f4, so it wins hands down no matter how sharp the canon is.

Unless you're a landscape tripod shooter


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PostPosted: Wed Oct 27, 2010 7:35 am 
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Do you really say that that extra stop is more important than a sharper lens?
Im not offensing you, but could you explain why?
Im buying a telelens soon, and I cant decide between the Canon 100-300 USM which fits my budget, the Canon 70-200 f/4 or the Sigma 70-200 f/2,8.

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Tamron 17-50 2.8, Canon EF 70-200mm f/4L USM,
Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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PostPosted: Wed Oct 27, 2010 8:58 am 
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do you mean 70-300 or 100-400 by any chance?
I am also looking at those zooms, but most likely will get the EF 100mm f/2.8L Macro IS USM first.
Wonder how that will go with an extender?

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PostPosted: Wed Oct 27, 2010 12:49 pm 
Ruben123 wrote:
Do you really say that that extra stop is more important than a sharper lens? Could you explain why?


Of course.

The f2.8 aperture has, for me, two main advantages.

1.) Depth of field. Sure f4 will give you some subject isolation, but f2.8 just gives you so much more. Sometimes if your shooting a subject and the background is either really close behind, or really distracting, you need to blow it out completely, and setting the aperture at 2.8 lets you do this so much more than an aperture of f4.

2.) Twice as much light. Say you're shooting a dark concert and you know you need a certain shutter speed to freeze the motion of the band, say 1/500 of a second. At f4 you may need an ISO of 3200, which on most cameras is pretty noisy. With an f2.8, you can lower your ISO a whole stop to 1600, which is suddenly very easily usable on all DSLRs. This works too by the same principals for sports where fast shutter speeds are needed.

Thats why Id recommend an f2.8 over an f4 any day. Even if the f4 has some sort of stabilisation, that doesnt help in either of the above situations.

Does that answer your question Ruben?

Cheers,
Jeremy


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PostPosted: Wed Oct 27, 2010 1:37 pm 
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From my experience with concerts, stabilisation might actually help on APS-C on focal lengths around 200mm. You'd need a shutter speed of 1/300th, where 1/100th is generally enough to capture facial expressions of the performers.

But in general use, I completely agree with Jeremy. Even 2.8 is still kind of slow for concerts.

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PostPosted: Wed Oct 27, 2010 2:36 pm 
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Yup, my questions are answerd :wink:

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Panasonic DMC-FZ18, Panasonic DMC-FZ28, Canon G5, Canon 350D, Canon 50D + BG-E2N
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Canon 18-55 II plus lots of Minolta MD/M42 lenses and bodies


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