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  1. #1
    Join Date
    Nov 2008
    Posts
    80

    Low light auto-focus problems...

    When using autofocus and the light situation is less than desirable I have some problems getting the camera to focus. It runs from on extreme to the other and never gets focused. This happens mostly with the kit lens, is this my problem. Is it the fact I am using an a-100?

    Any tips would be appreciated.

    Chris

  2. #2
    Join Date
    Mar 2009
    Location
    San Diego, CA
    Posts
    602
    Quote Originally Posted by jcray19 View Post
    When using autofocus and the light situation is less than desirable I have some problems getting the camera to focus. It runs from on extreme to the other and never gets focused. This happens mostly with the kit lens, is this my problem. Is it the fact I am using an a-100?

    Any tips would be appreciated.

    Chris
    How much low light are we talking about? Nighttime or other situations?

    I've not used the A100, but my suspicion is the kit lens is a primary factor coupled with the aperature setting. I've found that at nighttime, autofocus on my A900 functions best with the Sony 50mm f/1.4 prime, does pretty well with the Tamron 70-200mm f/2.8, and has problems with the Ritz liquidation Sigma 28-90mm D f/3.5-f/5.6.
    Darin Wessel
    α 900
    Zooms: Tamron SP AF70-200mm f2.8 Di LD Macro; Sigma 28-90mm D macro, Konica-Minolta 18-70 f3.5-5.6
    Primes: Minolta 28mm f2.8; Sony 50mm f1.4
    Minolta RC-1000 remote commander

    Film:
    Calumet Cambo CC400 4x5 View Camera
    YashikaMat 6x6 TLR (other accessories)
    Minolta Maxxum 7000 w/ Minolta 35-80mm f/4-5.6 & Minolta 2800 flash
    Minolta Maxxum 5000i & Vivitar 728 AFM flash
    What's next???

  3. #3
    Join Date
    Sep 2006
    Location
    Carlsbad CA
    Posts
    523
    A-The lens stinks and even if it focus's youll prolly not get the shot you want
    B- When it comes to night time i either expect a not so good shot or do everything manually including focusing.
    C-You will need a tripod or something else to use
    sony A300
    tamron 17-50 2.8
    Sony SAL 11-18
    Sony 35 1.8

  4. #4
    Join Date
    Jun 2008
    Posts
    2,204
    The lens is not the brightest of lenses, aperture (wise), so it will have a higher tendency to hunt when there's not enough light.

    You should either get a flash head with AF assist, pop up the flash to help focus, use a flashlight or manually focus.
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

  5. #5
    Join Date
    Apr 2006
    Location
    Sverige
    Posts
    54
    Additionally, of course, any lens with any camera will make the AF hunt forever if there isn't enough contrast in the scene.
    Last edited by Bup; 06-07-2009 at 01:29 PM.

  6. #6
    Join Date
    Jan 2008
    Location
    Ohio, USA.
    Posts
    1,161
    All of the above!! And add in to the mix that low light or lower lighting AF 'hunting' seems to be a bit of a ongoing Sony issue. I have never used the kit lens but there are plenty of comments and threads here about it! Most peopl seem to think target practice or a pen holder on your desk are the best uses for it. However I have seen plenty of very good photos on here from Frank with one.
    Sony A700_____________Minolta AF 50mm. F/1.7
    Minolta AF 70-210mm F/3.5-4.5 Tamron AF 17-50mm F/2.8 XR DiII LD Asp. [IF]
    Tamron SP AF 70-200mm. F/2.8 DI LD [IF] Macro
    Tamron AF 70-300mm F/4-5.6 Di LD Macro 1:2
    Tokina AF 28-70mm F/3.5-4.5
    Tokina AF AT-X 80-400mm F/4.5-5.6
    http://flickr.com/

  7. #7
    Join Date
    Jun 2008
    Posts
    2,204
    I can't believe the A200-A380 lack an AF assist lamp. Even the Nikon D40 has one!
    flickr

    Canon 7D - 5D | 550EX - 430EX II - (2) PW FlexTT5 | 24-105 f4L | 70-200 f2.8L IS | 100 f2.8L IS | 50 f1.8 II

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