Rumors > EOS Bodies
Rebel T3i/600D, T3/1100D? [CR1]
Stuart:
Is this part of a wider product shift strategy?
With the 7D previously being said to be the new 60D.
Is the 1100D the new 600D ?
nowinaminute:
The following are listed as the changes to the 550D.
* 18mp
* 9 Point AF
How did this even get on the site? Is there ANYONE who doesn't know the 550D has these features already? Not only is it a bad rumour but it's like the worst possible information you could have found in the entire world. Out of all the rumours and predictions this makes it to the front page? I'm sorry if I sound like a troll but at least publish the rumours from people who seem like they have a vague clue what they are talking about!
unruled:
--- Quote from: Stuart on January 03, 2011, 06:00:17 AM ---Is this part of a wider product shift strategy?
With the 7D previously being said to be the new 60D.
Is the 1100D the new 600D ?
--- End quote ---
to me it seems a little like that. Due to the technological advance, and pressure from competition, over the last 5 years the entry level (350/450/500/etc) have gained so many features that it has essentially jumped up to a new level. As a previous 350d owner, I feel like the 1000d is the new 350d.
and yep, I currently have a 40d and I do feel the 7D is a more direct follow up to it as opposed ot the 60d. This is purely my own view though.
spam:
--- Quote from: traveller on January 03, 2011, 05:46:13 AM ---An interesting point about USM motors, I hadn't seen this before. It goes against my expectations as USM motors are known not only for their speed, but also for their precision. Does this also apply to micro-USM? (N.B. the Powershot SX1 IS had a USM motor.)
--- End quote ---
I don't have a source for the USM-comment, so it might not be correct, but it could be one reason why Canon seem to lag in CD AF speed.
You need a high framerate from the sensor to get fast CD AF as CD AF analyze the video signal to focus the lens. PD AF use sensors that can determine how much out of focus the subject is and send an instruction to the lens how much closer or further away to focus.
CD AF can't to that, in stead the algorithm take one reading from the video stream, move focus a bit and check again. If focus is better (higher contrast) on the second reading then fine, it moved focus in the right direction and continue to do so until contrast decreases, then focus in the opposite direction. It will continue with this with steadily smaller focus shitfts until it can't get it better.
So, obviously doubling the frame rate mean it can do twice as many comparisions per seconds and get half the focus times - in theory. In practice focus speed will depend on two other factors (at least). The first possible bottleneck is the image processor which have to be able to keep up with the frame rate the sensor can deliver. That shouldn't be much of an issue. The second and possibly much more difficult obstacle is the lens which is designed for PD AF and not for small extremely fast repeated focus shifts. Which mean that the system is limited by how many times per second focus shifts can be done, and maybe how small shifts that are possible - I don't know enough detail about this to say where the real bottlenecks in the lens are. Maybe the focus motor, maybe mechanical tolerances contribute, and maybe the electronic protocol between body and lens is a limit.
Anyway, Oly/Panasonc added two new contacts when they moved from FT to mFT to improve AF performance and maybe Canon need to do the same, maybe not. I just hope they solve the problems so I can use my current lenses when they come out with a mirrorless system.
My comments about at 1000D successor being a new small camera didn't imply a higher crop factor at all. I can't see any reason why Canon shouldn't be able to make a 1.6 crop dSLR significantly smaller than 1000D.
All the last Canon superzooms SX1 IS/SX10 IS/SX20 IS/SX 30 IS (and I believe, alse eralier models) use an Ultrasonic motor, but not for focus. It's used to provide silent motorized zoom.
traveller:
--- Quote from: spam on January 03, 2011, 08:09:25 AM ---
My comments about at 1000D successor being a new small camera didn't imply a higher crop factor at all. I can't see any reason why Canon shouldn't be able to make a 1.6 crop dSLR significantly smaller than 1000D.
--- End quote ---
I wrote form factor, not crop factor and I was refering to the rumour about Canon producing a smaller APS-C DSLR (can't find the link at the moment -do you remember the one that had a picture of the EOS IX APS film SLR?). With hindsight, I should have made this clearer!
I have read that the Panasonic doubled the refresh rate of the GH2's sensor
http://www.luminous-landscape.com/reviews/cameras/panasonic_gh2_first_look.shtml
I've also read somewhere (but I can't remember where -typical!) that a slower refresh rate is one of the reasons that the new Nikons' CDAF is so much slower than the G-series. If so, then it was a poor strategy by Canon to fail to address this whilst pushing HD video in their DSLRs' marketing, as it is a feature that most amateurs would find very useful for video (it would also make the 60D's articulating screen far more useful for stills photography).
I'm not quite sure what the extra two connections on the lens mount do for micro-4/3rds lenses. If they truely help with CDAF then maybe Canon should have already started introducing such a system on new DSLRs and lenses.
I didn't know that the SX series still used a micro-motor for AF.
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