1. Welcome to Mu-43.com—a friendly Micro 4/3 camera & photography discussion forum!

    If you are thinking of buying a camera or need help with your photos, you will find our forum members full of advice! Click here to join for free!

Mu43 versus M43

Discussion in 'Other Systems' started by Mogul, Nov 16, 2012.

  1. Mogul

    Mogul Mu-43 Regular

    Nov 9, 2012
    Can someone tell me if there is a specific dividing line between Mu43 and M43, and if so, what is it? Thank you.
  2. Bizzarrini

    Bizzarrini Mu-43 Regular

    Apr 26, 2011
    The Netherlands
    There is no difference. There is M(u)43, meaning micro four thirds, and 43, meaning four thirds. The last category refers to the SLR line.
  3. Mogul

    Mogul Mu-43 Regular

    Nov 9, 2012
    Thank you. I assume then that all 4/3 cameras are the same and that "M" just means that the camera is mirror-less. Correct?

    Also, where does the word "Micro" fit in? I'm not talking about macro, but about micro as it describes the type of camera.

    Could it be said that any camera with a 4:3 aspect ratio and a 2X cropping factor is a Micro 4/3?
  4. LeoS

    LeoS Mu-43 Top Veteran

    Aug 6, 2012
    4/3 = four thirds

    M43 or Mu43 = micro four thirds

    M43 is mirrorless, but the 'm' stands for micro.
  5. Gurin

    Gurin Mu-43 Regular

    Feb 5, 2012

    No, that is not correct. 4/3 and m4/3 share sensor size but have different mounts. You can mount 4/3 lenses on m4/3 hoses with an adapter, but you cannot mount m4/3 lenses on a 4/3 house.
  6. With_Eyes_Unclouded

    With_Eyes_Unclouded Mu-43 All-Pro

    Apr 17, 2012
    "Mu" is the Greek Letter you see on on the logo top left. This one is the lowercase form, the uppercase is as in all Latin based languages. It's just a symbol for "micro".
  7. Bizzarrini

    Bizzarrini Mu-43 Regular

    Apr 26, 2011
    The Netherlands
    You are welcome. In addition to the other responses, let me adress the last question. The micro 4/3 standard includes not only sensor size and aspect ratio, but also defines software correction of lenses and lens mount communication protocols. Therefore, the Canon G1X, while it has a 4:3 aspect ratio and a crop factor of about 2, is no micro 4/3 camera.
  8. RobWatson

    RobWatson Mu-43 Hall of Famer

    Alphabet soup

    Along with Mu43, M43 and m4/3 don't forget MFT. EVIL, etc ... man, who can keep track of all this mess?
  9. dav1dz

    dav1dz Mu-43 Top Veteran

    Nov 6, 2012
    Don't forget "DSLM".
  10. flash

    flash Mu-43 Hall of Famer

    Apr 29, 2010
    1 hour from Sydney Australia.
    4/3 and m4/3 use the same sensor size. 4/3 cameras have an optical finder and a mirror, just like any DSLR. 4/3 cameras use PDAF focusing just like a DSLR.

    m4/3 cameras don't have a mirror box. Therefore the cameras and lenses can be made much smaller. m4/3 cameras use contrast detct focusing like compact cameras but now days that's just as fast as PDAF for stationary targets.

    So the difference between 4/3 and micro 4/3 is that the removal of the mirror box has allowed a smaller camera and lens. As a result of the change in flange distance the lens mount is different. As a result of the lack of a mirror the focus system is different.

    The other difference is that m4/3 is hugely sucessful and 4/3 is a dying system.

  11. carpandean

    carpandean Mu-43 Top Veteran

    Oct 29, 2010
    Western NY
    But DSLM and EVIL are technically categorical names suggested as alternatives to mirrorless, whereas m4/3 is a specific mount within that category.

    m4/3 is to 4/3 as Sony's E-mount (NEX) is to their A-mount (DSLR/DSLT). Both are meant for cameras with the same sensor size, but the former in each case is meant for a shorter (you asked "why micro?"; there's your answer) flange distance facilitated by removing the mirror, while the latter is meant for the longer flange distance necessitated by the mirror being between the mount and the sensor.

    (Gordon beat me while I was typing.)
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.