Newbie pentax kx ? About value changes.

Discussion in 'Digital Photography' started by shizz, Apr 1, 2010.

  1. shizz macrumors newbie

    Feb 28, 2010
    When working in manual setting on the body and lens. Should my shutter speed and aperture value change after each exopsure? For example if I'm taking a pic of a can and set my numbers it takes that pic. But the numbers switch on there own right after. So I have to set them again for the next exposure. Just to take a pic of the same can. What am I doing wrong.??? I'm using a pentax k-x dslr with the 18-55mm kit lens. Thanks in advance
  2. Edge100 macrumors 68000

    May 14, 2002
    Where am I???
    If the numbers are switching on their own, you're not in manual mode. In fact, it sounds like you are in a fully automatic mode (or program mode at least).

    A quick overview of the manual and semi-manual modes:

    Tv (shutter priority): you control the shutter speed, and the camera controls aperture based on the ISO speed you've set; use this mode when you absolutely need to stop motion or otherwise need a specific shutter speed

    Av (aperture priority): you control the aperture size, and the camera controls shutter speed based on the ISO speed you've set; use this when you want fine control over depth of field, and have enough light to ensure adequate shutter speed

    M (full manual): you control everything; I would suggest learning this mode as well as you can. You presumably bought a DSLR because you wanted more control over your images; well, here's your chance. There certainly are good reasons to use Av or Tv mode (such as when you're shooting subjects in constantly changing light), but learning to use M mode effectively is an important skill.
  3. shizz thread starter macrumors newbie

    Feb 28, 2010
    Edge100. Thanks for the quick responce but i am in manual. The dial on the body is set to M and on the side of the lens it's set to MF.
  4. Edge100 macrumors 68000

    May 14, 2002
    Where am I???
    That's strange then.

    Is the camera actually changing the exposure of the image or is it just suggesting new settings? I'm not familiar with Pentax specifically. On Canon bodies there's a little exposure indicator on the right side or bottom of the viewfinder which, when in M mode the camera, indicates the exposure relative to 0EV, which is proper exposure. So if the proper exposure is ISO 100, f/16, 1/100 and you are set to ISO 100, f/11, 1/100, the camera will indicate an overexposure of 1EV, but it wont change your settings to correct this.
  5. Designer Dale macrumors 68040

    Designer Dale

    Mar 25, 2009
    Folding space
    There is a forum on DP Review for Pentax owners. They may be more able to answer this question. My only thought is that it resets to a default setting after each shot while in manual.

    Pentax Forum. You may need to register.

  6. TheReef macrumors 68000


    Sep 30, 2007
    NSW, Australia.
    You're not by any chance hitting the green button?
    That'll automatically change your variables to get a correct exposure when in M.

    The only other real reason I can think of is if you're in exposure bracket mode.
    After each exposure, it'll change your exposure settings.
    (It'll take one neutral, one over exposed and one underexposed, something like 0 + - ).

    The option should be found in the menu with burst settings, 2 second timer (mirror lock up), 10 second timer, etc.
  7. Ruahrc macrumors 65816

    Jun 9, 2009
    I'm betting it's this. If you take 3 or 4 pictures, do the exposure values cycle in a repeating sequence?
  8. shizz thread starter macrumors newbie

    Feb 28, 2010
    the bracketing was turned on making my settings change. turned it off and they stopped changing

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