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Author Topic: Canon EOS Rebel T4i/650D Specs [CR2.5]  (Read 56303 times)

Marsu42

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #90 on: May 18, 2012, 06:30:56 PM »
There's still be reasons to get the 60D over the T4i (ergonomics, burst rate, button layout, etc)...they'd be the same as the T3i really, with the exception of the auto-focus.

I've got the 60d and am the first one to say it's a nice aps-c body which sadly lacks afma (thanks, Canon!) but runs magic lantern. But if the 650d would have an upgraded sensor the less expensive body would have better iq and less people will be convinced the better ergonomics of the 60d are important enough to justify the price difference.

I'd venture to suggest a new APS-C sensor in the Rebel 650D, and because Rebel land is a MP war zone, I think they will bump things up, if only slightly, and even with little or no improvement in ISO/DR  beyond software.

... you're saying his in spite of the different [cr2.5] rumor - courageous :-p

Moreover, it would not be unusual for a new sensor to appear in the Rebel first without first seeing XXD time:  the 10.1MP sensor of the 40D first appeared in the 400D.   So in that sense, the Rebels can be seen seen as a proving ground for new sensors. 

Again, this was a different time when there was more potential left in Canon's aps-c tech for frequent sensor updates and they had less aps-c bodies that could cannibalize each other...

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #90 on: May 18, 2012, 06:30:56 PM »

c.d.embrey

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #91 on: May 18, 2012, 06:43:34 PM »
Well, part of it is that they are different technologies. The way a Canon camera autofocuses for pictures is different than how it does in Live View, and video uses the Live View technology. Canon would have to adapt the SLT technology with a translucent mirror to auto-focus in the exact same way a Sony does. In doing so, they'd give up all the photographic advantages of the mirror, which isn't worth it. Basically, the Nikon autofocus sucks because it doesn't use the focus sensor (due to the mirror being up). I doubt Canon will have solved this in a way that makes it comparable with what sony has in their SLT's, let alone what the FS-700 has.

Sorry to tell you, but the NEX 5n does NOT use SLT technology. NO SLT, NO phase detect sensors being built into the imaging sensor like a Nikon J1/V1. The Sony NEX 5n doesn't use any form of phase detect for focusing, none, zip nada.

The NEX 5n uses contrast detect auto-focus, just like the quick focusing Olympus cameras. If Sony, Olympus and Panasonic can build good contrast detect auto-focus, why do you feel that Canon is so incompetent that they couldn't ???

dlleno

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #92 on: May 18, 2012, 08:01:49 PM »

... you're saying his in spite of the different [cr2.5] rumor - courageous :-p

bzzzt!  total brain fart thank-you for bringing reality back.  I still hope its a new sensor ... and do suggest it would be courageous for Canon to introduce a third generation Rebel with the same sensor, and at some level still interest me how an 18 mp sensor (new or not) says about the MP wars
Quote


Again, this was a different time when there was more potential left in Canon's aps-c tech for frequent sensor updates and they had less aps-c bodies that could cannibalize each other...

yea I mentioned that.. pre-tsunami days saw a lot of activity and lots of leap frogging.  the point is that there is no historical basis for predicting what Canon will do here in terms of how/when Rebel sensors are introduced relative to xxd. 

Lee Jay

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #93 on: May 18, 2012, 08:13:18 PM »
The NEX 5n uses contrast detect auto-focus, just like the quick focusing Olympus cameras. If Sony, Olympus and Panasonic can build good contrast detect auto-focus, why do you feel that Canon is so incompetent that they couldn't ???

"Good contrast detect auto-focus" is like "tasty raw herring".  While some might taste better than others, they all still take like dog doo.

Marsu42

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #94 on: May 18, 2012, 10:23:28 PM »
The difference in IQ from the 36MP D800 to the 12MP D700 completely debunks the widely held belief that increasing the MP of a camera must result in lower IQ.

No, the iq-mp correlation is of course "ceteris paribus" as all sane comparisons are.

If you update the sensor tech itsself like Nikon with Sony's exmor, then big leaps are possible as long as the lens delivers the resolution, the latter being more problematic on aps-c. But Canon being stuck with their own tech, it seems only small increases in mp are possible without beginning to loose on the dr or noise side.

stevenrrmanir

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #95 on: May 19, 2012, 12:04:48 AM »
Indeed, and Canon just wouldn't put a sensor into the 650d that can outgun the more expensive aps-c bodies. That's why they called it "650d", there will be a 70d with a sensor upgrade and *then* they'll put into a "700d".
Why not... think of the 450D (12 MP), which outgunned the 40D (12 MP). After the 450D, the 50D got a new 15 MP sensor. There is no reason why the 650D shouldn't get a new sensor, which will be later outperformed by the sensor of the 7D2.

BS dude! The 40D is a 10MP body.  The 40D is 10x the better camera for image quality (IQ) than the 450D. I have used both. The 450D is inferior to the 40D in every perspective!

The 650D is a FAIL if the specs are correct! Is this Canon's definition of an "upgrade" looks like? I hope they go the Sony way... they are dragging their feet! I hope Nikon kicks their asses!

briansquibb

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #96 on: May 19, 2012, 12:56:17 AM »
and you are suggesting that these improvements are substantially due simply to the fact that 36 is a bigger number then 12?

Are you suggesting there's a guaranteed deterioration in performance just because 36 is bigger than 12?


The difference in IQ from the 36MP D800 to the 12MP D700 completely debunks the widely held belief that increasing the MP of a camera must result in lower IQ.

I think the 5DII and 1DS3 put that belief to bed 5 years ago

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #96 on: May 19, 2012, 12:56:17 AM »

Woody

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #97 on: May 19, 2012, 02:23:07 AM »
Nikon have (fast) phase detect autofocus working with their mirrorless 1-series cameras.
Canon should be aiming to do the same!

Except that Nikon's phase detect AF works only in very good light. Under slightly lower conditions, they have to fall back on contrast AF which completely falls apart for Nikon:

"The J1 and V1's contrast-detection AF systems, which take over when light levels are too low for effective phase-detection AF (and remember that this is the camera's decision, not the photographer's) are less impressive. Focussing is less positive (AF wobbles quickly around the target rather than locking straight on it) but impressively accurate when it gets a 'lock'. The problem is that even in average interior room light, both cameras struggle to find that lock."
- http://www.dpreview.com/reviews/nikonv1j1/8

I'll rather have fast and accurate contrast AF all the way.

I am surprised no one ever comments on live view contrast AF in the Canon 5D3. It rocks, it really does! Under VERY low light conditions (f/1.4, 1/40 sec, ISO 25,600), it can lock focus while phase detect hunts and hunts and gives up. In good light, it's VERY fast. A serious step-up from previous Canon contrast AF technology.

If the same contrast AF is implemented in Canon's mirrorless cameras, they'll have a winner on their hands.

Woody

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #98 on: May 19, 2012, 02:33:19 AM »
BS dude! The 40D is a 10MP body.  The 40D is 10x the better camera for image quality (IQ) than the 450D. I have used both.

Obviously, you must either be lying to others or trying to deceive yourself.

From http://www.the-digital-picture.com/Reviews/Canon-EOS-Rebel-XSi-450D-Digital-SLR-Camera-Review.aspx:

"The EOS 40D and the XSi are very close to each other - even though the XSi has a more pixels packed into the same surface area of sensor."

From http://www.dpreview.com/reviews/canoneos450d/34:

"The new sensor is superb, and from a resolution point of view puts the EOS 40D to shame without losing any of the high ISO performance that has been Canon's trump card for so long."

Essentially a tie from DXOMark:
Canon 450D low light ISO = 692
Canon 40D low light ISO = 703

Suggest you get your facts right before posting next time

briansquibb

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #99 on: May 19, 2012, 03:18:33 AM »
BS dude! The 40D is a 10MP body.  The 40D is 10x the better camera for image quality (IQ) than the 450D. I have used both.

Obviously, you must either be lying to others or trying to deceive yourself.

From http://www.the-digital-picture.com/Reviews/Canon-EOS-Rebel-XSi-450D-Digital-SLR-Camera-Review.aspx:

"The EOS 40D and the XSi are very close to each other - even though the XSi has a more pixels packed into the same surface area of sensor."

From http://www.dpreview.com/reviews/canoneos450d/34:

"The new sensor is superb, and from a resolution point of view puts the EOS 40D to shame without losing any of the high ISO performance that has been Canon's trump card for so long."

Essentially a tie from DXOMark:
Canon 450D low light ISO = 692
Canon 40D low light ISO = 703

Suggest you get your facts right before posting next time

It is not all about low light IQ

DxO scores have lost all credibility, so quoting them is pretty meaningless.

From one that was there - the 450D was not as good a camera as the 40D

Bit like comparing the 600D with the 7D - you just wouldn't go sports shooting with the 600D

Just think that the 40D has more fps than the 5DIII and the low ISO IQ was excellent - would be interesting to compare the RAW files for noise

Woody

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #100 on: May 19, 2012, 03:50:10 AM »
DxO scores have lost all credibility, so quoting them is pretty meaningless.

From one that was there - the 450D was not as good a camera as the 40D

Bit like comparing the 600D with the 7D - you just wouldn't go sports shooting with the 600D

I agree with everything you say. But stevenrrmanir insisted the 450D has 10x poorer image quality than 40D, and that is simply not true. :)

!Xabbu

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #101 on: May 19, 2012, 08:23:38 AM »
DxO scores have lost all credibility, so quoting them is pretty meaningless.

From one that was there - the 450D was not as good a camera as the 40D

Bit like comparing the 600D with the 7D - you just wouldn't go sports shooting with the 600D

I agree with everything you say. But stevenrrmanir insisted the 450D has 10x poorer image quality than 40D, and that is simply not true. :)

+1 - the 450D has pretty impressive IQ and is definitely not a generation behind the 40D (or whatever 10x poorer means)...

c3hammer

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #102 on: May 19, 2012, 11:32:01 AM »
I use a T3i for both wildlife stills and video. 

If the T4i 9 point auto focus is anything close the 7D, the moire and aliasing in video gone like the 5d3 and it has resonable tracking focus with touch screen selectable points like many of the camcorders it will be an incredible upgrade in the sub $1000 price point.

With the 3x crop zoom in video mode, the T3i is one of the best wildlife cameras ever made.  A 70-200mm becomes a 960mm.  A 600mm becomes a 2880mm.  There's never been anything like it.  Anyone who says the IQ is not very good with the 3x zoom has never used it with a high end lens.

The only cam that even comes close is the panny GH2 and it falls down in so many other ways, particularly stills and highlight rendition, that it's not in the same league as an all arounder.

Really looking forward to seeing how this one comes out!

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #102 on: May 19, 2012, 11:32:01 AM »

briansquibb

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #103 on: May 19, 2012, 05:23:22 PM »
I use a T3i for both wildlife stills and video. 

If the T4i 9 point auto focus is anything close the 7D, the moire and aliasing in video gone like the 5d3 and it has resonable tracking focus with touch screen selectable points like many of the camcorders it will be an incredible upgrade in the sub $1000 price point.

With the 3x crop zoom in video mode, the T3i is one of the best wildlife cameras ever made.  A 70-200mm becomes a 960mm.  A 600mm becomes a 2880mm.  There's never been anything like it.  Anyone who says the IQ is not very good with the 3x zoom has never used it with a high end lens.

The only cam that even comes close is the panny GH2 and it falls down in so many other ways, particularly stills and highlight rendition, that it's not in the same league as an all arounder.

Really looking forward to seeing how this one comes out!

Cheers,
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rubidium

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #104 on: May 19, 2012, 10:08:56 PM »
June announcement = July shipping?

Just in time for tax return purchasing!

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Re: Canon EOS Rebel T4i/650D Specs [CR2.5]
« Reply #104 on: May 19, 2012, 10:08:56 PM »