1. Reminder: Please user our affiliate links to get to your favorite stores for holiday shopping!

AF 'beeping success', but completeley out of focus

Discussion in 'Olympus Cameras' started by kirschm, May 29, 2014.

  1. kirschm

    kirschm Mu-43 Regular

    82
    May 4, 2014
    Germany
    I am just testing my 2 year old Panasonic 20/1.7, because sometimes the AF is out of focus.

    Test environment:
    Center (small) focus field, no eye detection, high contrast subject within the focus field, not very bright (inside room conditions), using tripod for constant results.

    It might happen that I focus 30x and everything looks good (e.g. when checking by the magnification).

    Then the next 30x (same unchanged condition) the AF also tells me 'success' (by this beeping noise), but the result is completely (not only slightly) out of focus.

    What's the reason for 'indicating success', but beeing completely out of focus?
     
  2. barry13

    barry13 Super Moderator; Photon Wrangler

    Mar 7, 2014
    Southern California
    Barry
    Hi,

    1. which camera do you have?

    2. have you checked for a firmware update for the body + lens?

    Barry
     
  3. taz98spin

    taz98spin Mu-43 Top Veteran

    843
    May 13, 2011
    NYC
    I have a E-P5 and when I use my Oly 25/1.8 with it, I will always get the green confirm and beep noise indicating that the AF is in focus, but sometimes the shots are not in focus.

    It seems to me the focusing system is overly eager to focus?
     
  4. kirschm

    kirschm Mu-43 Regular

    82
    May 4, 2014
    Germany
    1. Pl1, pl2, pm2
    2. All up to date
     
  5. sammykhalifa

    sammykhalifa Mu-43 Top Veteran

    762
    Jun 22, 2012
    Pittsburgh PA
    Neil
    I know I have more success with AF on my EPL 2 when I switch over to the small focus box. There are instructions on it somewhere but I can't seem to find it right now.
     
  6. kirschm

    kirschm Mu-43 Regular

    82
    May 4, 2014
    Germany
    Sorry, forgot to mention: I already use the small focus box...
     
  7. dhazeghi

    dhazeghi Mu-43 Hall of Famer

    Aug 6, 2010
    San Jose, CA
    Dara
    Do you mind posting a full-sized example (on Dropbox etc.)? I do see occasional false confirmations on the E-PM2 with the 20/1.7 in lower light, but it is the exception, not the rule.
     
  8. kirschm

    kirschm Mu-43 Regular

    82
    May 4, 2014
    Germany
    It's not an issue of the PM2... I used the Pana 20/1.7 for more than 2 years with my old PL1 and PL2... I just checked all those pictures... and it's the same... be it PL1, PL2 or PM2...

    E.g. focussing a 3 meter subject... completely out of focus... and the focus distance in exiftool.exe shows 'infinitiy' as distance... I know the exiftool info might not be reliable... but in my cases it always reflects the mal-focussing of the Pana...
     
  9. kirschm

    kirschm Mu-43 Regular

    82
    May 4, 2014
    Germany
    I now decided for an alternative solution regarding Pana 20/1.7 and Olympus body (I have a separate Olympus body for the Pana only... I don't like changing lenses).

    I use a 'fast big sensor compact camera' for low light shooting (e.g. my Samsung Ex1)... the results in practice are better than Oly body plus Pana 20/1.7... a much better 'IBIS' (even 1/8 sec no problem) and very reliable focussing...
     
  10. dhazeghi

    dhazeghi Mu-43 Hall of Famer

    Aug 6, 2010
    San Jose, CA
    Dara
    Well, if it happens consistently and across different bodies, I'd be inclined to blame the problem on a bad copy of the lens. In theory this sort of thing shouldn't happen with CDAF, but I have seen reports of misfocussing lenses due to bad AF motors, though not of the 20/1.7 specifically.

    One other thing to do is to clean the contacts on the lens with isopropyl alcohol and ensuring that it is well seated.
     
  11. shg2

    shg2 Mu-43 Regular

    28
    May 14, 2014
    NY
    Is there a specific test we can do to verify if the AF motor is bad or not?
     
  12. phigmov

    phigmov Mu-43 Hall of Famer

    Apr 4, 2010
    It would be good to see an example if you can post one.

    Two quick things -

    * Sometimes I notice I get an AF confirm even though I'm out of focus - this is often because I'm within the minimum focus distance (usually me shooting flowers with a 20 or 45) and shooting a burst with unsteady hands
    * Sometime I get the thing I intended to be in focus, just out of focus (ie the AF has locked onto something else entirely and I'm blissfully unaware)

    Does using a centre-focus or tap-to-focus make any difference or increase your odds of a keeper ?