I've not seen anything that proves the NEX-5 has less rolling shutter or better low light performance than any of the Canon DSLRs.
Check this out:
http://www.luminous-landscape.com/reviews/cameras/sony-nex5.shtml
They say:
"My colleague Chris Sanderson and I spent a morning shooting side by side comparisons against the Canon 7D. Chris is a life-long director / cameraman / videographer, and has a professional's eye (...) One area where Sony seems to have the Canon licked was in terms of "jello" or the rolling shutter effect. Rapidly moving subjects or camera motion produced hardly any bending, while the Canon had quite a bit
I very much doubt a $2k camera is doing a full down sample of the entire sensor. For that price point, it will more than likely pixel binning, just like Canon and just like Panasonic.
I wish it did downsample, but I doubt, too. But who knows. Computational complexity of debayering process is similar, if not greater, yet all single sensor cameras do it in real-time. These chips are really fast.
The footage didn't prove anything to me. I've seen enough footage from the D90, 7D, GH1, 5D that were amazing but that they don't push all the cameras in all ways are far enough to really explain what the expect.
Not sure. I've been able to find the moire artifacts in most 7d footage on the web. I didn't spot them in VG10 footage, which doesn't prove anything, of course. We have to wait to be sure. However, I'm pretty sure they optimized the OLPF for video resolution, so we can expect much less moire. The OLPF design is not expensive - in fact you have them in every single camera on the market. It's just the matter of tuning their response properly. Why wouldn't they do it right?
I wouldn't expect manufacturers or those they work with to exploit the problems. Until this camera is in the wild, we wont know.
Yes, but it doesn't mean we can't talk, expect things and believe people who had the prototypes in their hands... Don't get me wrong - nobody said there's no (very little) moire so far. But just because it's video camera, we can expect it's optics to be tuned for video, including OLPF. This is what Panasonic will do in AF100, too - they reduce moire by OLPF (this is confirmed)
Pertaining to low pass filter, I've not seen an electronic implementation, can you explain how this is suppsed to work? An optical low pass filter, like the one used in almost all cameras, diffuses (or duplicates like a birefringent filter) the image across the pixel sites to spread out the high contrast spacial information into surrounding sites so it doesn't get lost in non-active areas.
If you tried to do this after you become electrical, the information is already gone. If you mean by pixel binning, this is a very poor way to down-convert, period.
This is (almost) true. The better definition is that the OLPF cuts the (optical) MTF as it approaches the sensor Nyquist. It's task is to filter out the spacial frequencies (details) that cannot be sampled by the sensor due to its limited spacial resolution. Those frequencies would otherwise alias. Keep in mind we (re)sample twice - first in the sensor and then when reducing the resolution to match the video raster size.
By applying OLPF which cutoff frequency has been optimized to match video raster size (no matter what real sensor resolution is), one can reduce video moire, even if in-camera downsampling is as simple as line skipping (decimation) with no additional filtering - the aliasing will simply not be introduced if there are no frequencies that can alias.
The other way of achieving similar goal is to use the digital antialias filter in-camera, prior to resampling. Of course there's still OLPF (every camera has it), but it is tuned for native sensor resolution, just like in DSLR. and not video raster size. This technique has some great advantages, but, as you know, it's complex.
In this context this two scenatios can be used to achieve similar goal - get rid of some details prior to (re)sampling to avoid aliasing:
lens->olpf (tuned for native sensor resolution)->digital lp filter->decimation
lens->olpf (tuned for video raster size)->decimation
I agree that pixel binning is very bad method of downsampling. The only reason it is used is because it's so easy. In fact, it does both digital filtering and decimation in one pass. Computationally very easy, but the filter kernel is rectangular (averaging from certain number of pixels), which is far from perfect in terms of response - poor rolloff and very significant side lobes (spectral leakage).
I would think the moire/aliasing of the sony will be more in line with the GH1. Using a stronger OLPF for the final target of 1080p will probably improve the picture from a moire/aliasing perspective, I agree,
This is exactly what I meant.
but if they use the same pixel binning, my opinion is it will look a little softer than the GH1 and 7D.
Not necessarily. The highest part of the MTF does not affect the sharpness at all. On Panavision site there's nice presentation on it. It's the middle of the MTF that determines the perceived sharpness. The highs only affect the texture perception, and, in my opinion, moire destroys textures much more than some gentle smoothing.
The only reason I think people are complaining about 24p is because it's one of the only things we don't have to wait and see that they didn't implement.
Don't forget they're preparing 'pro' inexpensive s35 camera. I fully understand people complaining about lack of 24p, but I understand Sony, too. As long as there's no real competition, they want to maximize their income...
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