Old Pentax 70 Zoom

Discussion in '35mm Cameras and Accessories' started by fencer, Dec 5, 2013.

  1. fencer

    fencer Member

    Messages:
    20
    Joined:
    Feb 14, 2009
    Location:
    Union of Soc
    Shooter:
    Multi Format
    Hi all,

    I have a couple of questions about Pentax 70-Zoom.

    It's probably the 1st or 2nd series and it looks exactly like the one shown here: http://stareaparaty.pl/aparaty/pentax-zoom-70/

    There are three buttons on the front panel - one with a flash icon, one with a small sun icon and one with a clock icon (which most probably enables the self timer).

    There is also a small LCD on the top of the case, but it only indicates number of shot frames.

    How do I know if the flash is enabled or disabled? What does the sun icon mean?

    How to check if the AF works properly? I can't hear anything when I try to press the shutter release halfway, and the AF motors are usually pretty noisy.

    The battery is fresh of course.

    Can't find any user manual online.
     
  2. Ricardo Miranda

    Ricardo Miranda Member

    Messages:
    2,141
    Joined:
    Mar 31, 2012
    Location:
    London, UK
    Shooter:
    35mm
  3. Nikon Collector

    Nikon Collector Member

    Messages:
    162
    Joined:
    Dec 7, 2009
    Location:
    Carolina Bea
    Shooter:
    35mm
    It's exposure compensation for backlit subjects
     
  4. Ricardo Miranda

    Ricardo Miranda Member

    Messages:
    2,141
    Joined:
    Mar 31, 2012
    Location:
    London, UK
    Shooter:
    35mm
    You might not find the answer to this one on the manual, so here it goes:
    P&S cameras normally employed an active AF system, while SLR (that you probably are used to) use a passive system.
    The Active AF system works this way: when you press the shutter button halfway, the system emits an infared beam through one window. The beam hits the subject and it is reflected back to another window. The time it takes to travel to the subject and back gives the system the distance to subject and that value is locked into memory.
    When you press fully the shutter button, the AF motors put the lens in the right distance and the photo is taken. This system has a disadvantage: there is a delay between pressing the button and the shutter actually firing. That's why they aren't suitable for fast action shots.
    You can read a bit more about the different systems here: http://en.wikipedia.org/wiki/Autofocus
     
  5. AgX

    AgX Member

    Messages:
    12,205
    Joined:
    Apr 5, 2007
    Location:
    Germany
    Shooter:
    Multi Format
    A basic idea about the working of an autofocus can be got by watching the front element move.

    A better insight you get by checking the focus in the film plane (if possible) or by exposing a film.
     
  6. AgX

    AgX Member

    Messages:
    12,205
    Joined:
    Apr 5, 2007
    Location:
    Germany
    Shooter:
    Multi Format
    The time lag is used at acustic active systems. Optical active systems use triangulation.
     
  7. fencer

    fencer Member

    Messages:
    20
    Joined:
    Feb 14, 2009
    Location:
    Union of Soc
    Shooter:
    Multi Format
    Ricardo, that seems to be the case. The lens move only when I press the button all the way down and the shutter fires.

    Wouldn't know how to check the focusing performance without a film, since there's no B setting...

    Thank you all for you advice and links.
     
  8. AgX

    AgX Member

    Messages:
    12,205
    Joined:
    Apr 5, 2007
    Location:
    Germany
    Shooter:
    Multi Format
    Some point&shoot cameras have a long-exposure (though not B) setting. I do not know if such would be sufficient fot focus check. One might have to do some tricks to make it release at all.
     
  9. Ricardo Miranda

    Ricardo Miranda Member

    Messages:
    2,141
    Joined:
    Mar 31, 2012
    Location:
    London, UK
    Shooter:
    35mm
    The minimum shutter speed is 1/40s. That is a bit tight to check for focus. The best way is still to shoot a test roll and try to use all functions to check if they work as advertised.
     
  10. fencer

    fencer Member

    Messages:
    20
    Joined:
    Feb 14, 2009
    Location:
    Union of Soc
    Shooter:
    Multi Format
    Yes, I'm not THAT quick, LOL :wink:

    I'm already on my way to buy a film.
     
  11. elcabezagrande

    elcabezagrande Subscriber

    Messages:
    793
    Joined:
    Jul 20, 2010
    Location:
    Iowa
    Shooter:
    Multi Format
    That is the original IQZoom, the first in a long line of Pentax Espio/IQZoom cameras. It has an exceptional lens, and outstanding macro capability for an early compact AF camera. Expect good results from it.
     
  12. Nikon Collector

    Nikon Collector Member

    Messages:
    162
    Joined:
    Dec 7, 2009
    Location:
    Carolina Bea
    Shooter:
    35mm
    If I remember right, there are several funcions that don't work unless film is in the camera.