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  1. #31

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    On the selenium meter thought. I am wonder if I can build a meter out of modern solar cell? They seem to generate significantly more power than the selenium cell of the same size.

  2. #32
    Roger Cole's Avatar
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    I don't get the battery thing either, unless the type is rare and hard to come by and/or expensive. You have to carry enough film. WTH, carry enough batteries.

  3. #33

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    Quote Originally Posted by Chan Tran View Post
    On the selenium meter thought. I am wonder if I can build a meter out of modern solar cell? They seem to generate significantly more power than the selenium cell of the same size.
    You can. It's just a matter of calibrating the meter movement and scale to the response curve of the cell. Modern cells are likely more durable, however the extra power is of no account - you don't need it.

  4. #34
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    Quote Originally Posted by Chan Tran View Post
    I am wonder if I can build a meter out of modern solar cell?
    Theoretically yes. There's a lot of research going on in photovoltaics, and the technology is changing rapidly.

    Two obvious issues to be addressed:
    1) spectral response v. that of film, and
    2) sensitivity (i.e. performance at low light levels).

    It would certainly be worth some experimentation.

    - Leigh
    “Wise men talk because they have something to say; fools, because they have to say something.” - Plato

  5. #35

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    Quote Originally Posted by Roger Cole View Post
    I don't get the battery thing either, unless the type is rare and hard to come by and/or expensive. You have to carry enough film. WTH, carry enough batteries.
    Why bother if you don't need to? Have you ever researched how much energy goes into producing a single AA cell vs. what you get out of it? They're horrible.

    I love simple things that work - I think the hinge is an elegant device.

  6. #36

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    Quote Originally Posted by Leigh B View Post
    Theoretically yes. There's a lot of research going on in photovoltaics, and the technology is changing rapidly.

    Two obvious issues to be addressed:
    1) spectral response v. that of film, and
    2) sensitivity (i.e. performance at low light levels).

    It would certainly be worth some experimentation.

    - Leigh
    Yes it would be worth looking into. I have a 'solar' powered scientific calculator that works under very low light, such as a single 11w CFL used on a porch at night, maybe 8-9 feet away.

  7. #37

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    Quote Originally Posted by Leigh B View Post
    Theoretically yes. There's a lot of research going on in photovoltaics, and the technology is changing rapidly.

    Two obvious issues to be addressed:
    1) spectral response v. that of film, and
    2) sensitivity (i.e. performance at low light levels).

    It would certainly be worth some experimentation.

    - Leigh
    What about just getting a Seconic L-398A Studio Delux III ? They have done it already to replace the selenium with a silicon cell

    Ulrich

  8. #38
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    Quote Originally Posted by Ulrich Drolshagen View Post
    They have done it already to replace the selenium with a silicon cell.
    Hi ulrich,

    Chan Tran was asking about a modern replacement for Selenium, which is a generator of electricity.

    Silicon is not a generator, it's a resistor, so it requires a battery.

    Selenium or a modern replacement would not need a battery.

    - Leigh
    “Wise men talk because they have something to say; fools, because they have to say something.” - Plato

  9. #39
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    I would not hesitate the endorse the purchase of a used Minolta Autometer, the IVf or the Vf version.

    Kenko purchased the Autometer Vf design after Minolta exited the lightmeter business, rebadged it and now sell it as their KFM-1100

  10. #40

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    Quote Originally Posted by Leigh B View Post
    Hi ulrich,

    Chan Tran was asking about a modern replacement for Selenium, which is a generator of electricity.

    Silicon is not a generator, it's a resistor, so it requires a battery.

    Selenium or a modern replacement would not need a battery.

    - Leigh
    You may want to have a look here. In german it's said to be a 'amorphe Silizium-Zelle' 'Silizium' is german for silicon.

    Ulrich

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