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GH2 : to ETC or not to ETC ?

Discussion in 'Panasonic Cameras' started by amanieux, Jun 16, 2011.

  1. amanieux

    amanieux Mu-43 Rookie

    16
    Jun 13, 2011
    hello

    for filming in 1080p, will i get better a better image quality from a nikon 50mm f1.8 vs the panasonic 20mm f1.7*2.6 ETC crop mode=52mm ?

    i know that the 20mm is more compact and it will AF but i am concerned about ETC image quality

    the ETC crop mode that give you a x2.6 while filming is supposed to not change image quality but it does not seem very logical as downsampling 2mpixel from a 16mpixel image should give much better results than just croping the 2mpixel in the center of the sensor (no oversampling at all) - did i miss something ?

    thanks
     
  2. nickthetasmaniac

    nickthetasmaniac Mu-43 All-Pro

    Jan 11, 2011
    I think you missed something.

    With ETC the GH2 is shooting HD 'natively', which means it doesn't need to rely on computing algorithms to down-sample, which could theoretically degrade IQ.
     
  3. amanieux

    amanieux Mu-43 Rookie

    16
    Jun 13, 2011
    yes that was my point downsampling=better IQ so i don't understand why i read some claims that ETC suffer no image degradation.
     
  4. nickthetasmaniac

    nickthetasmaniac Mu-43 All-Pro

    Jan 11, 2011
    Why would downsampling result in better IQ? (genuine question, this all puzzles me...)
     
  5. amanieux

    amanieux Mu-43 Rookie

    16
    Jun 13, 2011
    reducing a 16mpix image to 2mpix image would improve IQ as having 8 samples per pixel would improve aliasing and reduce noise.
     
  6. brunerww

    brunerww  

    53
    Mar 5, 2011
    I am not a pixel-peeper, but I have noticed little, if any, GH2 image degradation in 1080i or 1080p using ETC when lighting conditions were good.
     
  7. sprinke

    sprinke Mu-43 All-Pro

    Apr 5, 2011
    Pasadena, CA
    Debi
    Well, I have the 20mm and a Nikon 50mm f/1.4 lens; in theory I should be able to do this test. Are you wanting to use the 1080p 24fps setting?
     
  8. amanieux

    amanieux Mu-43 Rookie

    16
    Jun 13, 2011
    yes 1080p/24 is a perfect test. could you try both lens at f1.7 and also both lens at smaller apertture (like f5) to get most of the scene sharp.

    thanks