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PostPosted: Fri Dec 16, 2011 10:52 pm 
Hey guys, I was wondering if anyone could help me with my query...

Would the auto-focus work on video mode on the T3i if you use EF-S lense?

As I understand that the the T3i doesnt have autofocus on video mode, only on camera mode.

Hope someone can help me with this, as this would help me decide whether to get a Nikon 5100D or the Canon T3i. :)


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PostPosted: Sat Dec 17, 2011 12:16 am 
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No autofocus in video mode. Doesn't depend on what lens you use. You can press the autofocus button with any lens but the focus is pretty slow and may have strange effects on the exposure for that time.

But the autofocus on the D5100 isn't fast either - in most cases it's easier and faster to use manual focus with both cameras.
If you want a camera with full time autofocus on video mode you should look for a Sony with a translucent mirror.

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PostPosted: Sat Dec 17, 2011 12:52 am 
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To date, the auto focus on DSLR cameras are nowhere near the auto focus motors in video cameras. DLSR auto focus is pretty rubbish on some models and really horrible on others. Most of the time I just manually focus or just try again.

D5100 tends to hunt a lot and sometimes if a subject moves or the camera is moved the focus will get lost very quickly and then come back into focus as the camera gets confused. Also, on quiet shoots, I can hear the motor hunting when I play back the video on my computer lol.

In the end, what I just do is zoom in all the way manually focus on the subject, zoom back to wide, raise the f/ number and make sure I have a deep depth of feild.

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1) Olympus OM1 [Zuiko Auto-S 50mm f/1.8]
2) Pentax MZ-60 [Sigma 28-90 & 100-300]
3) Canon 7D [EF-S 15-85 & 70-200mm f/4 IS & 50mm f1.4]
4) Leica M [50mm Summicron Pre-aspherical - Silver]

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PostPosted: Sat Dec 17, 2011 1:18 am 
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But again: Take a look at the Sony A65 - it has autofocus in video mode and it works!

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PostPosted: Sat Dec 17, 2011 2:15 am 
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Getting a little off topic for the Canon forum, but AF on the Sony A65 is with the lens wide-open only, and you also lose manual control of shutter and ISO. And video clip length is limited to 29 minutes in all regions. You may also encounter overheating issues before then if you shoot with IS. And the LCD is hinged at the bottom.

Getting back to the Canon T3i, Canon's downscaling algorithm has significant moire and aliasing. And video clip length is limited to 12 minutes. (And there's no AF as noted above.)

The D5100 also has no manual control of aperture, shutter and ISO. (There's a way to preset these values and then lock exposure which works ... until you forget and lose a shot, or worse shots.) And video clips are still limited, in this case to 20 minutes. And as noted above, the AF motor is noisy.

For full manual control with quiet AF and no video clip time limit in the U.S., you need to check out Panasonic's G-series.

Full disclosure: I own a GH1 and GH2 - Mark


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PostPosted: Sat Dec 17, 2011 3:35 am 
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Quote:
But again: Take a look at the Sony A65 - it has autofocus in video mode and it works!


Ah, I didnt think of Sony. Sorry I just am not a big fan of Sony imaging products. When it comes to cameras I just automatically think of Canon, Nikon, Pentax and Olympus.... (Sigma, Leica and Vorts-something german) are the others I think of for lenses.

Im still upset Rico is trying to buy out pentax

and back on topic, if you want a video camera, my first suggestion is always get a video camera - they are pretty cheap nowadays, and handle video 100000000 times better than any DSLR out for the time being and for a fraction of the cost.

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1) Olympus OM1 [Zuiko Auto-S 50mm f/1.8]
2) Pentax MZ-60 [Sigma 28-90 & 100-300]
3) Canon 7D [EF-S 15-85 & 70-200mm f/4 IS & 50mm f1.4]
4) Leica M [50mm Summicron Pre-aspherical - Silver]

http://www.poetproductions.net


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PostPosted: Sat Dec 17, 2011 4:17 pm 
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Leo wrote:
Vorts-something german

Voigtländer? (for those who don't live in Germany, it's spoken: "Foctlander")

Yeah, personally I like Sony's Playstation but still the cameras are getting better and better, following Konica-Minolta.

Still - cheap video cameras might handle AF better than any DSLR but the image quality... :roll:

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PostPosted: Sat Dec 17, 2011 11:02 pm 
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Leo wrote:
my first suggestion is always get a video camera - they are pretty cheap nowadays, and handle video 100000000 times better than any DSLR out for the time being and for a fraction of the cost.

There's nothing like a bit of good old hyperbole to get your point across in a discussion.

I do agree that a dedicated camcorder is generally much easier to use but recording video with a DSLR isn't like trying to put an elephant through a letter box while you're drunk and spinning on a turntable, being tickled with feathers.

I'm an amateur with video recording and my 550D did a decent job recording despite the subject moving towards and away from me. See for yourself: http://youtu.be/JK4nxaB5VxU

Depending on the subject and how you're filming, you may not be much worse off using a DSLR to film.

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DSLRs: Canon EOS 70D, 30D
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Lenses: Panasonic Lumix G 14-42mm f/3.5-5.6


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