Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,302   Posts: 1,536,201   Online: 699
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1

    Join Date
    Oct 2009
    Location
    Central Florida, USA
    Shooter
    Multi Format
    Posts
    3,920

    Fractional reading on Sekonic meter

    I'm confusing myself and the manual isn't all that helpful, so here's a question....

    On Sekonic meter (mine is 758DR), the display reads out 1/10th value. When set to F mode (aperture priority mode) and the meter reads T=4 and 9/10th and F = 5.6, does this mean it's proximately t=1/8th of a second and f/=5.6??

    My question isn't how T=4 means 1/4 second. It's about when fractions are displayed, how it translate to the shutter speed value.

    Assuming t=1/4 second and 9/10th is almost 1/8 second
    Does t=2s (note SECOND) and 9/10 is almost 4s or 1s?

    Is the fraction about MORE or LESS light in fraction or actual value displayed (with would be reciprocal in most instances as it's really 1/x for shutter speed and f/ itself is already a reciprocal.

    Argh....!
    Develop, stop, fix.... wait.... where's my film?

  2. #2
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    the villages .centralflorida,USA and Germany
    Shooter
    Multi Format
    Posts
    6,464
    Images
    1
    Strange. My Gossen always displays fixed timing increments, even in aperture mode. How else would you set the shutter?
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  3. #3

    Join Date
    Oct 2009
    Location
    Central Florida, USA
    Shooter
    Multi Format
    Posts
    3,920
    Hi, Ralph....

    Mine does that too. In aperture priority mode, it displays 4, 2, 1, 1/2, 1/4, 1/8....1/60, 1/125, 1/250, etc.
    Along with it there is a 1/10th scale. 1/10th scale is right next to the aperture display but according to the manual, it refers to the shutter speed, not aperture. (in this mode)

    On Sekonic, 1/10th becomes 1/10th shutter speed (in stops) when in Aperture priority mode and the area dedicated to shutter speed only displays in fixed increments. My confusion is how to apply this fractions. Also, as we know, when we cross 1 second in + or - directions, the numerical value means opposite. How do we translate that? (I don't know how else to describe this)
    Develop, stop, fix.... wait.... where's my film?

  4. #4

    Join Date
    Oct 2009
    Location
    Central Florida, USA
    Shooter
    Multi Format
    Posts
    3,920
    I called Sekonic. Apparently, this means 9/10 OVER. (ie. meter is seeing more light)
    So 1/60 and 9/10 would mean almost 1/125
    and 4 second and 9/10 would mean almost 2 second

    and Sekonic support says I can also read this as fractional component to the f stop as well. Now thinking more clearly, that makes sense.
    Develop, stop, fix.... wait.... where's my film?

  5. #5
    CGW
    CGW is offline

    Join Date
    Apr 2010
    Shooter
    Medium Format
    Posts
    2,798
    All display modes can be customized to display different increments of reading on my 558 and I suspect on the 758 as well. Check your manual's custom setting list for a setting that works best for you.

  6. #6
    Robert Hall's Avatar
    Join Date
    Aug 2004
    Location
    Lehi, Utah
    Shooter
    ULarge Format
    Posts
    2,040
    Images
    28
    tkamiya,

    you are correct. These meters were made for the studio and having 1/10th stop adjustments just help position lights.

    As I use mine with black and white film, 1/2 stop is close enough so that if I am over 5/10ths I just move the aperture to the appropriate setting.

    I have not found any way to make the display go to say 1/3rd stops, but I've not looked that hard either.
    Robert Hall
    www.RobertHall.com
    www.RobertHall.com/mobile
    Apug Portfolio
    Facebook Profile


    Technology is not a panacea. It alone will not move your art forward. Only through developing your own aesthetic - free from the tools that create it - can you find new dimension to your work.

  7. #7
    Diapositivo's Avatar
    Join Date
    Nov 2009
    Location
    Rome, Italy
    Shooter
    35mm
    Posts
    1,844
    Just to state the obvious, the meter gives you a reading, and a positive offset to that reading.

    If it says 1/125 at f/16, +5/10, that means 1/125 at f/16, "plus half a stop". How you compute this half stop, as aperture or shutter time, it is totally irrelevant.

    Normally though if you have an old-school lens you would certainly see this, in your mind, as an aperture modifier, because normally you can place aperture anywhere (they don't have to coincide with "clicks", you can close the diaphragm "1/3") whereas with shutter times you are not guaranteed how the shutter time works in intermediate positions between "clicks". Some shutters might even be damaged, maybe. Diaphragms, on the other hand, are 99% of the times designed to be closed "continuously"(*)

    So if the light meter tells you 1/125, f/11 plus 2/10, and you want to use exactly that value, you can set the aperture ring just a little bit past f/11.

    I agree the main use of 1/10th of stop is to check luminance rations, and even illumination of background, etc. in studio work. Otherwise makers would rather make lightmeters work in 1/3, or 1/2 of a stop.

    Fabrizio

    (*) This might not apply to your lens. Your mileage may vary. Do any experiment to your own risk. By reading this text, you acknowledge that no damage, present of future, will be claimed from its author. Etc. etc. etc.
    Fabrizio Ruggeri fine art photography site: http://fabrizio-ruggeri.artistwebsites.com
    Stock images at Imagebroker: http://www.imagebroker.com/#/search/ib_fbr

  8. #8

    Join Date
    Oct 2009
    Location
    Central Florida, USA
    Shooter
    Multi Format
    Posts
    3,920
    The tech support guy put it this way.

    "The meter is receiving light THAT much (tenth of stop reading) more than what shutter speed and aperture reading."

    That made it very clear to me. Why don't they say that in the manual.... for us beginners....
    Develop, stop, fix.... wait.... where's my film?

  9. #9
    benjiboy's Avatar
    Join Date
    Apr 2005
    Location
    U.K.
    Shooter
    Multi Format
    Posts
    6,765
    It really Isn't rocket science I'm almost seventy two and I have no problem understanding the L-358, I have three digital light meters and find them all quicker to use and less liable to misinterpretation than the Gossen Profisix (Lunapro S.B.C), and Western Euromaster that I have since retired, I find they take some of the mental arithmatic out of calculating my exposures by being able to to remember up to nine readings and average them at the push of a button.
    Ben

  10. #10
    Greg Davis's Avatar
    Join Date
    Feb 2004
    Location
    Crestview Hills, KY
    Shooter
    8x10 Format
    Posts
    1,909
    Even though the manual states that the fraction is for shutter speed when in SS Priority, there is no reason you can't use it the same as 1/10 f/stop in Aperture Priority mode. Switch between modes and you get the same reading. In fact, until you posted this problem, I had never read that part stating the fraction referred to the shutter speed in that mode. If it says, f/5.6 .3, just set it 1/3 between 5.6 and 8.
    www.gregorytdavis.com

    Did millions of people suddenly disappear? This may have an answer.

    "No one knows that day or hour, not even the angels in heaven, nor the Son, but only the Father." -Matthew 24:36

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin