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  1. #1
    stradibarrius's Avatar
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    Another meter question???

    I have an old analogue Gossen Luna-Pro F and just got a new Gossen DigiPro F yesterday. I am trying to learn how to use the meter effectively so please try to understand the question.

    I set out taking reading in different places comparing the reading in the "Incident" mode.
    The two meters surprisingly give the same readings. I also used My Nikon F4, F100 Bronica ETRS and my NIkon D300 to compare the reading with the meters. I would then take the shot with the digital for instant feedback and see if ti was correctly exposed.

    When I set the DigiPro F to f/5.6 and take a reading the meter shows the f/stop in 1/10 of a stop so the reading would be f/5.6 and the a small number showing the tenths over f/5.6.
    Is there a way to Make the meter read exactly f/5.6 without showing the tents of a stop?
    The problem is when the DigiPro-F reads 5.6 plus 6/10s of a stop, for example, it produces a shot that is overexposed. If I change the meters aperture setting it give a reading of f/4 and 6/10s and also changes the shutter speed...

    I hope this question makes sense????
    "Generalizations are made because they are generally true"
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    Barry
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  2. #2

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    The meter displays what you should use for the 'perfect' exposure.
    Why would you want to ignore the information it provides, that a full f-stop setting is not quite it, and you need to open up or close the aperture more to get that 'perfect' exposure?

    Did you set those fractional f-stops (or nearest possible setting) on your digicamera when testing?

  3. #3
    stradibarrius's Avatar
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    Yes I did use the fractional setting with my digital but I am not really interested in my digital. My RB67 does not have fractional settings. Neither does my M645 or ETRS. The only film camera, I have, that has fractional settings is my F100.
    How do I correctly use the information given by the meter when my cameras will not adjust to such precise settings? If the meter has a f/stop reading that is 5/10 or higher should I adjust my reading to the next higher stop? Conversely if the reading is 5/10 or lower should I adjust to the next lower stop?

    Do all the digital meters read in fractions of f/stops?
    "Generalizations are made because they are generally true"
    Flicker http://www.flickr.com/photos/stradibarrius
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    Barry
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  4. #4

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    Your cameras will allow setting apertures in at least half, possibly 1/3 stops settings.
    Even with 'only' 1/2 stop settings, you will never be off more than 2/10 of a stop. Close enough.

    So you just round the reading the meter gives to the nearest settable setting, keeping in mind the old thingy that negative film likes overexposure better, slide film underexposure better than the other thing.

    And yes, all the digital meters give readings in at least 1/3, most in 1/10 stop steps.
    You want metering devices to give accurate readings, after all.


    Analog meters do the same, by the way. Their meter needles don't treat the scale as only having full stop positions they can move to, but will happily move to any position in between.

  5. #5
    stradibarrius's Avatar
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    Thanks!
    "Generalizations are made because they are generally true"
    Flicker http://www.flickr.com/photos/stradibarrius
    website: http://www.dudleyviolins.com
    Barry
    Monroe, GA

  6. #6
    stradibarrius's Avatar
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    I started a different thread asking a specific question about the Gossen DigiPro-F. Help if you can.
    "Generalizations are made because they are generally true"
    Flicker http://www.flickr.com/photos/stradibarrius
    website: http://www.dudleyviolins.com
    Barry
    Monroe, GA

  7. #7

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    I am a bit puzzled why the example would lead to overexposure as 5.6 + 6/10's is closer to f8 and less exposure.
    "There are a great many things I am in doubt about at the moment, and I should consider myself favoured if you would kindly enlighten me. Signed, Doubtful, off to Canada." (BJP 1914).

    Regards
    Bill

  8. #8
    markbarendt's Avatar
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    Quote Originally Posted by stradibarrius View Post
    Is there a way to Make the meter read exactly f/5.6 without showing the tents of a stop?
    What mode is the meter in?

    If it is in Shutter Priority mode it will display fractional/decimal F-stops. That's the only way it can get it right.

    Aperture Priority mode will/should keep a constant F-stop (i.e. exactly f/5.6) and time will instead float to get it right.
    Mark Barendt, Ignacio, CO

    "We do not see things the way they are. We see things the way we are." Anaïs Nin

  9. #9

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    Quote Originally Posted by cowanw View Post
    I am a bit puzzled why the example would lead to overexposure as 5.6 + 6/10's is closer to f8 and less exposure.
    If you would ignore the decimal bit, set f/5.6 instead of f/5.6 + 0.6, you'd be overexposing by 0.6 of a stop.

  10. #10
    wiltw's Avatar
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    Quote Originally Posted by stradibarrius View Post
    Yes I did use the fractional setting with my digital but I am not really interested in my digital. My RB67 does not have fractional settings. Neither does my M645 or ETRS.
    If you use the AE Prism of the ETRS, it sets shutter speed with 1/3EV increments; the AE-II Prism sets shutter speed with 1/6EV increments.

    And the PE lenses allow the meter to detect 1/2EV settings of the aperture.

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