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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 08 Jan 2013 (Tuesday) 07:28
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Canon v Sigma For Intermediate Snapper

 
2n10
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Jan 08, 2013 22:22 |  #16

Since you are talking sports definitely the 7D as your immediate upgrade path. FPS and AF performance are the reasons.


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kfreels
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Jan 08, 2013 23:01 |  #17

Another recommendation on the body upgrade. As someone who has both the 7D and the T2i along with a Sigma 70-200 f2.8 OS version I can tell you that it acts completely different on the two bodies. The f2.8 lens activates the high sensitivity center AF point on the 7D and it it just awesome - even in those night-time sporting events.


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tkbslc
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Jan 09, 2013 01:05 |  #18

T2i has an f2.8 center point, too, but yes the 7D AF is better all around.


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lucasmcd
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Jan 09, 2013 02:03 as a reply to  @ tkbslc's post |  #19

Another vote for getting the 7d , they are at such a great price at the moment and if a new one does turn up soon it is going to cost a lot more so I would jump onto the 7D.


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MNUplander
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Jan 09, 2013 09:09 |  #20

I don't think another vote is going to sway your opinion one way or the other at this point, but given that you're a sports shooter and you already have decent lenses I would throw in another recommendation for the 7D.


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Jan 09, 2013 10:03 as a reply to  @ post 15464015 |  #21

Well I certainly can not argue with upgrading to the 7D but the Canon 70-200mm f2.8 II is the best 70-200 on the planet.
The 7D and this lens is a wonderful sports, or nature, duo. I highly recommend it. If you can afford the price of admission.
If you need to do so in steps get the 7D first.


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kfreels
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Jan 09, 2013 10:36 |  #22

tkbslc wrote in post #15464524 (external link)
T2i has an f2.8 center point, too, but yes the 7D AF is better all around.

Yeah. I know. And that's always bugged me that both say "extra sensitivity at f2.8" in the specs. But having them both I can tell you that the 7D center with an f2.8 lens is definitely more sensitive than the center on the T2i. It will get AF lock in situations where I can't get it at all on the T2i with the same lens. I suppose it could just be coincidence but I don't think the AF detectors in the center are identical in the two cameras.


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Lbsimon
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Jan 09, 2013 12:44 |  #23

I upgraded from the XSi (450D) to a 60D, and the difference in IQ was drastic. A much better sensor, plus the speed and auto focusing - it all really improved the quality, more than any lens upgrade.




  
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tkbslc
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Jan 09, 2013 16:16 |  #24

kfreels wrote in post #15465925 (external link)
Yeah. I know. And that's always bugged me that both say "extra sensitivity at f2.8" in the specs. But having them both I can tell you that the 7D center with an f2.8 lens is definitely more sensitive than the center on the T2i. It will get AF lock in situations where I can't get it at all on the T2i with the same lens. I suppose it could just be coincidence but I don't think the AF detectors in the center are identical in the two cameras.

The center f2.8 point on the Rebel bodies is just an extra line type sensor. So it uses the F5.6 cross to get close and switches to an f2.8 line to refine it. (I guess generalizing Rebel bodies doesn't work now that the T4i has 60D AF, but you get what I mean)

Since the 40D, the higher end bodies have an f2.8 center point with a rotated cross type sensor. Think of it like an X shape. So the f5.6 sensor shaped like a cross gets the AF close and then an X shaped f2.8 sensor refines it. So at this point the target has been "sensed" on 4 different axes.

SO I agree, it's WAY better implemented on the higher end bodies, I just thought you were implying the T2i didn't have an f2.8 sensitive point.


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kfreels
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Jan 09, 2013 17:46 |  #25

tkbslc wrote in post #15467470 (external link)
The center f2.8 point on the Rebel bodies is just an extra line type sensor. So it uses the F5.6 cross to get close and switches to an f2.8 line to refine it. (I guess generalizing Rebel bodies doesn't work now that the T4i has 60D AF, but you get what I mean)

Since the 40D, the higher end bodies have an f2.8 center point with a rotated cross type sensor. Think of it like an X shape. So the f5.6 sensor shaped like a cross gets the AF close and then an X shaped f2.8 sensor refines it. So at this point the target has been "sensed" on 4 different axes.

SO I agree, it's WAY better implemented on the higher end bodies, I just thought you were implying the T2i didn't have an f2.8 sensitive point.

Aha. Thanks for clearing that up for me!


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RPCrowe
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Jan 09, 2013 18:18 as a reply to  @ post 15464015 |  #26

I also agree with upgrading to the 7D. The autofocus capability of this camera is absolutely out of this world! Mine was great out of the box in default mode

IMAGE: http://rpcrowe.smugmug.com/Other/San-Diego-Polo-Club-Del-Mar/i-tQZcDm4/0/L/Polo%20Match%20Del%20Mar_1709_edited-1-L.jpg
IMAGE LINK: http://rpcrowe.smugmug​.com …661018&k=tQZcDm​4&lb=1&s=A  (external link)

However, the auto focus of this lens can be tweeked in quite a few ways to improve captures. Exactly how you might want to tweak the A/F depends exactly on what type of action you are shooting.

Youtube has quite a few videos on 7D autofocus. Here's one...

http://www.youtube.com​/watch?v=KGZBnay8MJM (external link)

See my images at http://rpcrowe.smugmug​.com/ (external link)

  
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Canon v Sigma For Intermediate Snapper
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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