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'Sigma SD1 vs Pentax 645D'

Discussion in 'Other Systems' started by RT_Panther, Aug 2, 2011.

  1. Ulfric M Douglas

    Ulfric M Douglas Mu-43 Hall of Famer

    Mar 6, 2010
    Northumberland
    You don't want to put some words or something to go with your link?
     
  2. RT_Panther

    RT_Panther Mu-43 Legend

    May 4, 2011
    Texas
    Nope.
    I'm not looking for a debate - this is purely informative :smile:
     
  3. drd1135

    drd1135 Zen Snapshooter

    Mar 17, 2011
    Southwest Virginia
    Steve
    "On paper, the 645D has the resolving power that would make the SD-1 grow some bowels just so that it could defecate itself in fear."

    At least the author is apparently unafraid of making bold rhetorical choices.
     
  4. Luke

    Luke Mu-43 Hall of Famer

    Jul 30, 2010
    Milwaukee, WI
    Luke
    Well, I read the set-up and then kept looking for a place to click to see the battle. Am I missing something? Or is it just a set-up and the conclusion is left up in the air?

    Help.
     
  5. usayit

    usayit Mu-43 Hall of Famer

    Along the same lines.. but a bit more interesting IMO:

    2010 Mini Medium Format Shoot-out

    They threw in the 1ds mark III and Leica M9 as a small format comparison.
     
  6. LovinTheEP2

    LovinTheEP2 Mu-43 Top Veteran

    619
    Feb 15, 2011
    Toronto
    Left wanting more as well. Would have been nice to at least see.. compare for yourself type images..
     
  7. RT_Panther

    RT_Panther Mu-43 Legend

    May 4, 2011
    Texas
    Definitely would have been interesting to have the Leica S system :smile:
     
  8. ~tc~

    ~tc~ Mu-43 Hall of Famer

    Oct 22, 2010
    Houston, TX
    I am not quite convinced of the Foveon argument that their sensors have 3x the resolution because of the different layers vs Bayer array.

    Seems to me they are clutching at straws trying to justify the amazingly high price.
     
  9. Hikari

    Hikari Mu-43 All-Pro

    Nov 26, 2010
  10. RT_Panther

    RT_Panther Mu-43 Legend

    May 4, 2011
    Texas
    1) Foveon vs Bayer has always ended in a stalemate everywhere that I've seen....:biggrin:

    2) The price issue has to do with sensor fabrication. Sigma/Foveon have no other users/customers & they make their own. Not exactly cheap like Sony, Panasonic, and Canon. Oh and Sony, Panasonic, & Canon are MUCH bigger than Sigma/Foveon & thus have more resources available to them...:smile:
     
  11. LovinTheEP2

    LovinTheEP2 Mu-43 Top Veteran

    619
    Feb 15, 2011
    Toronto
    I always thought that it was like have 3 images stacked vs. 1 flat image from the other arrays, hence why the Fovean solution was always marketed as better pixel resolving as each pixel is resolved 3 times.
     
  12. RT_Panther

    RT_Panther Mu-43 Legend

    May 4, 2011
    Texas
    Interesting :smile:
     
  13. Hikari

    Hikari Mu-43 All-Pro

    Nov 26, 2010
    The "complaint" with a Bayer pattern is that it only samples one color at each point on the sensor. The image then has to be interpolated to make each pixel RGB. Since the Bayer pattern is 2 green pixels to one red and blue pixel, spatially a 12 mp sensor is only has 6mp of resolution in green and 3 mp in red and blue. (Sigma accurately should say their sensor is truely 15mp, and their competition is somewhere between 7.5 and 3.25 mp, but that would be a hard marketing pitch.)

    However, that is not really the end of the story. The Bayer interpolation is very sophisticated and so you really are not losing that resolution the color pixels would suggest. The advantage of non-Bayer interpolation is not significant in what most folks use cameras for. It does have value, however, in scientific imaging where you are really pushing resolution to where you are trying to get definition in threshold detail at the limits of system resolving power.

    To give an example, the following two images where taken with the same camera (click on the thumbnail to see the images). These are 100% crops. The first is with Bayer interpolation. The second is real color--the sensor is shifted by one pixel length vertically and horizontally and separate red, green, and blue exposures are taken over the same point. Your first impression will probably be there is no difference, but look closely at the surface texture and you will see there is little extra resolution in the real color image.
     

    Attached Files:

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  14. RT_Panther

    RT_Panther Mu-43 Legend

    May 4, 2011
    Texas
    I like the "image/color thickness" of the Foveon sensor....Here are a few images from my Sigma DP2 to try and illustrate...:redface:

    5313155438_a0791e8ace_z.
    'The Color Of Foveon X3' by RedTail_Panther, on Flickr

    5401037091_14c66e3852_z.
    SDIM0185 - '1967 Shelby AC Cobra' by RedTail_Panther, on Flickr

    5456101717_f2de654395_z.
    SDIM0214 - 'San Antonio Museum Of Art' by RedTail_Panther, on Flickr

    5403321128_1eb31852c9_z.
    SDIM0194 - 'MG Cars' by RedTail_Panther, on Flickr

    5408578279_39b88bff43_z.
    SDIM0206 - '1974 Corvette' by RedTail_Panther, on Flickr

    5497635324_b81e89783d_z.
    SDIM0277 - 'Dodge Challenger' by RedTail_Panther, on Flickr

    5483361665_5821947b12_z.
    SDIM0255 - 'Ford GT' by RedTail_Panther, on Flickr
     
  15. LovinTheEP2

    LovinTheEP2 Mu-43 Top Veteran

    619
    Feb 15, 2011
    Toronto
    Oh man.. do bad Sigma hasn't been doing enough with their initial DP concept. So little evolution ;-(
     
  16. RT_Panther

    RT_Panther Mu-43 Legend

    May 4, 2011
    Texas
    Yeah..per your signature block,
    I use my DP2 when I want a certain look but you're correct, it's tough to use it as an only camera..(That's why I also have an XZ-1) :smile:
     
  17. Hikari

    Hikari Mu-43 All-Pro

    Nov 26, 2010
    Personally, I will stick with the 645D.