Sigma SD9 Digital SLR X3
- Trådstartare sagan
- Start datum
Naturligtvis måste man ju se till totalekonomin. Jag ser inte heller Sigma som ett realistiskt alternativ idag. Men det beror mest på "brännviddsförlängningen" som gör objektiv i de brännvidder jag är intresserad av onödigt dyra och klumpiga så länge de är byggda för film.
sagan
Avslutat medlemskap
It's amazing how many people still don't get it...
Two pixels side by side on an X3 image can have completely different colour (black / white, whatever). This can never be the case on a Bayer CFA image because of the way even a black and white shot is demosaic'd, every output pixels is an average of the surrounding pixels. Take a close look at a D30 or D60 resolution chart and you'll see what I mean.
Imagine a single wire stretched across a piece of white paper.. Taken with a Bayer CFA sensor the wire would be at least two pixels wide all the way across the image (plus some alias to keep the line smooth). With an X3 sensor the line would be one pixel wide.
If you want a rough approximation of what an X3 image could look like take a Bayer CFA image and downsample it by 50% in Photoshop. Doing this will in effect merge surrounding RGB pixels into one pixel and you'll be left with the kind of sharpness and resolution we can expect from the SD-9.
BTW. doing this to a 6 MP image will result in a 1.5 MP image.
--
Phil Askey
Editor / Owner, dpreview.com
http://www.dpreview.com/forums/read.asp?forum=1014&message=3432204
exempel:
http://www.dpreview.com/forums/read.asp?forum=1014&message=3434444
Two pixels side by side on an X3 image can have completely different colour (black / white, whatever). This can never be the case on a Bayer CFA image because of the way even a black and white shot is demosaic'd, every output pixels is an average of the surrounding pixels. Take a close look at a D30 or D60 resolution chart and you'll see what I mean.
Imagine a single wire stretched across a piece of white paper.. Taken with a Bayer CFA sensor the wire would be at least two pixels wide all the way across the image (plus some alias to keep the line smooth). With an X3 sensor the line would be one pixel wide.
If you want a rough approximation of what an X3 image could look like take a Bayer CFA image and downsample it by 50% in Photoshop. Doing this will in effect merge surrounding RGB pixels into one pixel and you'll be left with the kind of sharpness and resolution we can expect from the SD-9.
BTW. doing this to a 6 MP image will result in a 1.5 MP image.
--
Phil Askey
Editor / Owner, dpreview.com
http://www.dpreview.com/forums/read.asp?forum=1014&message=3432204
exempel:
http://www.dpreview.com/forums/read.asp?forum=1014&message=3434444
Nä, det är sant. De är fet-dyra. Men priserna sjunker...Och sedan varierar förlängningen på olika kameror. För något år sedan sa en del att "det är ingen idé att bygga full frame sensorer".
Om ett år eller tre sitter de nog i kameror betydligt billigare än 80.000:-.
Köper man Sigma då också, om argumentet idag är att det inte behövs någon kantskärpa?
Vad har det med saken att göra?
