Minolta SRT 101 Battery check needle question.

Discussion in '35mm Cameras and Accessories' started by Vsanzbajo, Jul 15, 2013.

  1. Vsanzbajo

    Vsanzbajo Member

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  2. E. von Hoegh

    E. von Hoegh Member

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    You might have the wrong cell installed. I don't remember what the '101 uses, but you can get what you are describing if you put an alkaline or silver oxide cell (1.5v nominal, a new alkaline can be 1.58 - 1.60v) in a camera intended for a mercuric oxide (1.35v) cell. I mention this because I have an Asahi meter which clips onto a Pentax H1a, it came to me with an alkaline cell in instead of a mercury cell, and it does exactly what you describe.
     
  3. mweintraub

    mweintraub Member

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    Which battery are you using? If you're using a more modern battery then the voltage is different from what it's expecting. I think what you're seeing is that the meter is off because of the voltage difference.

    Can anyone confirm my suspicions?
     
  4. Vsanzbajo

    Vsanzbajo Member

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    I am using a 1.5 v Varta battery 625U. Will this really affect my exposure. When i do the battery check, the needle sits just 1mm above the rectangle that you can see in the picture.
     
  5. E. von Hoegh

    E. von Hoegh Member

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    Yes. It will lead to underexposure.
     
  6. mweintraub

    mweintraub Member

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    Which can be overcome by adjusting the iso dial to compensate.
     
  7. E. von Hoegh

    E. von Hoegh Member

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    Yes, but that works only if you know how much. The OP will need to compare it to another camera or meter of known accuracy. An alkaline cell's voltage is about 18% higher than a mercury cell.
     
  8. rolleiman

    rolleiman Member

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    Slight underexposure can benefit transparency film, resulting in richer colours. Remember a stated ASA speed is a guide, it's not written in stone. Different metering systems will expose differently. It's up to you to discover the best film speed setting for your camera/film combination.
     
  9. Chan Tran

    Chan Tran Member

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    If the needle is above the rectangle then I think the battery voltage is too low rather than too high. Without the battery the needle is all the way up and the battery voltage drives the needle downward.
     
  10. Marvin

    Marvin Member

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    Check it with a known good meter or try f16 rule.
     
  11. mweintraub

    mweintraub Member

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    Well of course.
     
  12. Vsanzbajo

    Vsanzbajo Member

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    I agree with you, I tried the 1.3 wein cell and the needle is further up. Any suggestions?
    Thanks
     
  13. leicarfcam

    leicarfcam Member

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    In all probability the meter would work fine but the glue used to bond the meter cell blocks to the prism has yellowed and cracked. The fact that your is indicating above this rectangle tells me not enough light is reaching the cells. If the battery voltage is above the 1.35v needed the needle will drop below this rectangle..
    for more information..
    See here http://colynsfotografs.com/srt.html
     
  14. Chan Tran

    Chan Tran Member

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    You can recalibrate the BC function. If you remove the base plate there are 2 variable resistors (potentiometers). One of them is for the light meter and another is for the battery meter. But I personally wouldn't worry much about the STt 101 meter, I would rather use it as a meterless camera.
     
  15. E. von Hoegh

    E. von Hoegh Member

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    Argh. I had it backwards. Sorry - it's been at least 4 or 5 years since I handled an SRT.:redface: