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Next: resizing digital photos
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External
Since: Jun 03, 2004
Posts: 917
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(Msg. 16) Posted: Sat Feb 02, 2008 7:01 am
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
Archived from groups: rec>photo>digital>slr-systems (more info?)
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In article <EtVoj.332$XI.145@text.news.virginmedia.com>, David J Taylor
<david-taylor.DeleteThis@blueyonder.neither-this-bit.nor-this-bit.co.uk> wrote:
> I just checked the Nikon spec for the D300 LCD and they do speciify
> "dots".
>
> http://www.europe-nikon.com/product/en_GB/products/broad/1436/specifications.h
> tml
>
> However, DPReview call it 922,000 "pixels".
>
> http://www.dpreview.com/previews/nikond300/page2.asp
>
> Hum.....
phil should know better, and i'm inclined to think that may just be a
typo because he correctly explains the situation in detail on the next
page:
<http://www.dpreview.com/previews/nikond300/page3.asp>
It has four times the number of dots than the 230,000 unit used on the
D2X and other such cameras. For clarity, the words pixels and dots are
interchanged almost randomly in specification sheets but strictly
speaking we should talk of dots (these being red, green or blue
sub-pixels) when referring to the figures quoted by manufacturers. The
D300's LCD has 921,600 dots, 1920 columns by 480 rows, the dots are a
third thinner than they are high and so each group of three dots
(sub-pixels) make up one full color pixel. |
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External
Since: Oct 17, 2007
Posts: 490
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(Msg. 17) Posted: Sat Feb 02, 2008 9:42 am
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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In article <13q8a0vnqa80p4a.TakeThisOut@corp.supernews.com>, G.T.
<getnews1.TakeThisOut@dslextreme.com> wrote:
> One of the few times I wholeheartedly agree with RichA. I'm finding I'm
> leaving my 35mm f/2 on my Rebel XT more and more. If the Sigma had a
> faster lens, and a real sensor I'd buy it in an instant.
You'd be making a huge mistake. |
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External
Since: Jun 03, 2004
Posts: 917
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(Msg. 18) Posted: Sat Feb 02, 2008 2:08 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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In article <bob-DDAC97.13122402022008 RemoveThis @news.verizon.net>, Robert Peirce
<bob RemoveThis @peirce-family.com.invalid> wrote:
> This is getting into what is is? Sigma claims their RGB is stacked,
> instead of flat, so they are getting three signals from each pixel.
that's true, but contrary to sigma advertising materials, the signals
are *not* rgb at every pixel. the sensor measures three overlapping
samples across the spectrum (look at the patents or white papers) which
is then converted into rgb.
> Actually, I believe the flat sensors double up on one of the colors,
> green I think, so a 10Mp standard sensor really only has 7.5Mp.
bayer sensors divide up the pixels into 50% green, 25% red and 25%
blue. all pixels are used, and a 10mp sensor has 10 million sampling
locations, resulting in a 10 mp image.
> I have
> as much problem with that as I do with Sigma's 14Mp. In some strange
> way, Sigma may be more honest in this regard.
nope. there are only 4.65 million spatial sampling locations and sigma
is inflating the count by three.
> In any case, the buyer has to investigate the various claims, and in the
> final analysis, the actual image is what really counts.
agreed. >> Stay informed about: New Sigma Turd |
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External
Since: Oct 09, 2004
Posts: 45
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(Msg. 19) Posted: Sat Feb 02, 2008 6:15 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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In article <020220080015515943%nospam@nospam.invalid>,
nospam <nospam DeleteThis @nospam.invalid> wrote:
> speaking we should talk of dots (these being red, green or blue
> sub-pixels) when referring to the figures quoted by manufacturers. The
> D300's LCD has 921,600 dots, 1920 columns by 480 rows, the dots are a
> third thinner than they are high and so each group of three dots
> (sub-pixels) make up one full color pixel.
Doesn't it take four dots?
--
Robert B. Peirce, Venetia, PA 724-941-6883
bob AT peirce-family.com [Mac]
rbp AT cooksonpeirce.com [Office] >> Stay informed about: New Sigma Turd |
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External
Since: Nov 17, 2004
Posts: 15
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(Msg. 20) Posted: Sat Feb 02, 2008 8:49 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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On 01-Feb-08 21:36:03, Mr. Strat said
>In article <9WLoj.204$XI.1@text.news.virginmedia.com>, David J Taylor
><david-taylor.TakeThisOut@blueyonder.neither-this-bit.nor-this-bit.co.uk> wrote:
>> Well, I was pointing out that Sigma was not the only company to use a dot
>> count rather than an RGB pixel count.
>I don't know of any other company that inflates their megapixel count.
Nikon did with the D1X. They said it was X megapixels (5?) but this was
atcually after interpolating one of the dimesions. Before the
interpolation it was 4 point somrthing megapixels, I believe.
All the best,
Angus Manwaring. (for e-mail remove ANTISPEM)
I need your memories for the Amiga Games Database: A collection of Amiga
Game reviews by Amiga players http://www.angusm.demon.co.uk/AGDB/AGDB.html >> Stay informed about: New Sigma Turd |
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External
Since: Jun 03, 2004
Posts: 917
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(Msg. 21) Posted: Sat Feb 02, 2008 8:49 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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In article <827.989T321T12493492angus.RemoveThis@angusm_ANTISPEM_.demon.co.uk>,
Angus Manwaring <angus.RemoveThis@angusm_ANTISPEM_.demon.co.uk> wrote:
> Nikon did with the D1X. They said it was X megapixels (5?) but this was
> atcually after interpolating one of the dimesions. Before the
> interpolation it was 4 point somrthing megapixels, I believe.
<http://www.dpreview.com/reviews/nikond1x/>
The D1X's pixel grid layout is rectangular rather than square (though
still uses the Bayer GRGB colour filter array), in camera processing
turns the 4028 x 1324 raw pixels (5.33 megapixel) into a 3008 x 1960
pixel image (5.9 megapixel). While it's clear that some interpolation
is being carried out in the vertical direction (to get from 1324 rows
to 1960 rows) there is also compression in the horizontal direction
(reducing from 4028 to 3008 columns), this compression is used to add
detail to the vertical data. Nikon argue that because the input and
output resolution are almost identical no image degradation will be
visible. Something we'll be able to test later in this review... >> Stay informed about: New Sigma Turd |
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External
Since: Nov 28, 2007
Posts: 46
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(Msg. 22) Posted: Sun Feb 03, 2008 10:28 am
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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Robert Peirce wrote:
> In article <020220080015515943%nospam@nospam.invalid>,
> nospam <nospam.DeleteThis@nospam.invalid> wrote:
>
>> speaking we should talk of dots (these being red, green or blue
>> sub-pixels) when referring to the figures quoted by manufacturers. The
>> D300's LCD has 921,600 dots, 1920 columns by 480 rows, the dots are a
>> third thinner than they are high and so each group of three dots
>> (sub-pixels) make up one full color pixel.
>
> Doesn't it take four dots?
>
No. A Bayer sensor uses quad arrangements of four primary filters,
RGBG, but a display device, monitor, TV, etc, uses three, RGB. I
believe the Foveon has three layers, sensitive to blue green and red in
that order.
Colin D
--
Posted via a free Usenet account from http://www.teranews.com >> Stay informed about: New Sigma Turd |
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Since: Sep 21, 2006
Posts: 1380
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(Msg. 23) Posted: Sun Feb 03, 2008 3:49 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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Woollyzone wrote:
> Paul Furman wrote
>
>> The Ricoh looks interesting, 24mm f/2.5 (10mp is maybe too much though for
>> a small sensor).
>
> I haven't found it to be too much so far, although its high iso performance
> is a little dubious, but I get round that by using longer exposures. The
> lens, and particularly the macro capabilities are quite astounding for such
> a littleun. There's a gallery of some shots I took recently with it in
> Krakow here... http://www.pbase.com/steve_sharp/krakow
>
> By the way, I'm not a P&S afficionado for the sake of it, I also have a 400D
> (Xti), its just that I don't always wish to carry it around when on the
> move.
Some nice shots. >> Stay informed about: New Sigma Turd |
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External
Since: Oct 09, 2004
Posts: 45
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(Msg. 24) Posted: Mon Feb 04, 2008 1:55 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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In article <l1ubq3tmmv9elbfsk41tm9och1e82fa2sv.TakeThisOut@4ax.com>,
Robert Coe <bob.TakeThisOut@1776.COM> wrote:
> That statement is just short of an oxymoron. The quality of a pocketable
> camera is limited by the size of the lens. It's unavoidable under the laws of
> physics,
Yes and no. I had an Olympus XA that took remarkable pictures. They
probably weren't as good as my Canon A-1, but they were still excellent.
>
> : There were also some serious photographers who so liked the convenience
> : of an always-carried camera that they used such cameras most of the time.
>
> That market will eventually be obliterated by cell phone cameras. My new
> Blackberry Pearl has a 3Mp camera. :^)
How good is the lens? Most of the cell phone images I have seen so far
are pretty bad. That doesn't mean they won't get better, just that they
aren't there yet. Also, the Mp doesn't matter that much. My daughter
has a 2Mp camera that takes excellent images as long as you don't try to
enlarge them too much. I have been very happy with a 6Mp DSLR, but I
have good lenses to go with it, and I don't try to go bigger than 12x18.
--
Robert B. Peirce, Venetia, PA 724-941-6883
bob AT peirce-family.com [Mac]
rbp AT cooksonpeirce.com [Office] >> Stay informed about: New Sigma Turd |
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External
Since: Oct 17, 2007
Posts: 490
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(Msg. 25) Posted: Mon Feb 04, 2008 1:56 pm
Post subject: Re: New Sigma Turd [Login to view extended thread Info.]
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In article <bob-E96ABB.11440904022008.DeleteThis@news.verizon.net>, Robert Peirce
<bob.DeleteThis@peirce-family.com.invalid> wrote:
> How good is the lens? Most of the cell phone images I have seen so far
> are pretty bad. That doesn't mean they won't get better, just that they
> aren't there yet. Also, the Mp doesn't matter that much. My daughter
> has a 2Mp camera that takes excellent images as long as you don't try to
> enlarge them too much. I have been very happy with a 6Mp DSLR, but I
> have good lenses to go with it, and I don't try to go bigger than 12x18.
I have 16x20s from my 6.3MP and plan to do some 20x24s in the near
future. >> Stay informed about: New Sigma Turd |
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