Why don't Sony and Pentax have this problem? Dead pixels, defective pixels

A problem that has plagued Nikon entry to upper entry bodies since the
D80. All the cameras sport Sony sensors. Is it possible that Nikon
knowingly buys (at a cut rate) defective sensors, that most won't
notice have a problem, reserving the good sensors for the D200's on
up? Is it possible neither Sony nor Pentax will use defective ones?

http://nikonrumors.com/forum/topic.php?id=2662&page=12

 

Probably more to do with (battery saving?) method used for pixel-binning
for downsampling to HD video - that's where most of the problems seems
to be reported (rather than for stills) in the few posts I read on that
link. At least as annoying (IMO) is jiggly aliasing artifacts from poor
downsampling with other dslr HD output. An affordable video cam with
APS-c native 1080p sensor with appropriate AA filter would be nice.
Does such a thing exist?
I hope the next d*00 doesn't use a version of the D7000 sensor. Would
be a retrograde step for Nikon to offer a camera in that range with a
tighter crop ratio. Cutting the sensor size to save a few bucks might
be okay at the lower end, but I'd be a bit pissed off if 10mm became
11mm on my next "DX" nikon body.

 

I don't think you have to worry too much about that changing from 23.6mm
x 15.8mm sensor to a 23.6mm x 15.6mm one.

And I tend to assume that the 23.6mm x 15.6mm is the new Nikon DX
standard. They don't usually chop and change their sensor sizes too
often. With the D100 in 2002, Nikon introduced a sensor sized at 23.7mm
x 15.6mm. The same size (though not the same sensor) was used in the
D70, D70s, D2, D2X, D50, D40, D40x. Then they introduced a new size of
23.6mm x 15.8mm in the D200, and used the same size for the D80, D60,
D300, D90, D300s, D5000, and D3000 (there was an overlap between the new
and old between the D200 and D80 (2006) and the D40x (2007)).

Since introducing the 23.6mm x 15.6mm sized sensor in the D7000, they
are now using it in the D5100.

Apart from the Return Of The D100 Sensor Size in the 2007 D40x (they
probably had a few lying around) the only oddity is the D3100.
Introduced between the last 23.6 x 15.8 sensor camera and the first 23.6
x 15.6 one, it has a 23.1mm x 15.4mm sensor. Time will tell whether that
remains an oddity, or is the new standard size for D3xxx series cameras.

Apteryx

 

On 10/04/2011 12:12 p.m., Apteryx wrote:
The same size (though not the same sensor) was used in the

Ok, there was no D2. And the D2X (and D2Xs, D2H and D2Hs) had different
sized sensors. The D2X (and I think the D2Xs) within the "normal" DX
range at 23.7mm x 15.7mm), while the D2H and D2Hs were smaller, 23.3 x
15.5 and 23.1 x 15.5, close to the present D3100.

Apteryx

 

I doubt it, since the problem long predates video in DSLRs.

 

My bad. Don't know where I got the idea that Nikon had released other
cameras (than the D3100) with smaller (than 1:1.5 crop) sensors.
The difference between 23.6 and 23.1 mm isn't inconsequential. YMMV.

 

I'm pretty sure that the size stated is for the effective pixels /
imaging area.

 

it's a bigger number, so why not use it?

it needs pixels around the periphery for black level, among other
things.

 

Through the years (D70/D200/D300) I've seen different raw converters
also come up with different image sizes for a given camera.

 

Likewise, but I suspect that's just where they cut off the edges of the
RGBG matrix in demosaicing.