Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 70,200   Posts: 1,531,492   Online: 949
      
Page 2 of 3 FirstFirst 123 LastLast
Results 11 to 20 of 28
  1. #11
    BetterSense's Avatar
    Join Date
    Aug 2008
    Location
    North Carolina
    Shooter
    35mm
    Posts
    2,862
    I made a rudimentary meter like this for my pinhole cameras, because I was tired of the sun going behind clouds and messing up my exposures. I describe it on my (very embryonic) website


    http://chazmiller.com/projects/pinmeter.html
    f/22 and be there.

  2. #12
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    the villages .centralflorida,USA and Germany
    Shooter
    Multi Format
    Posts
    6,428
    Images
    1
    Quote Originally Posted by BetterSense View Post
    I made a rudimentary meter like this for my pinhole cameras, because I was tired of the sun going behind clouds and messing up my exposures. I describe it on my (very embryonic) website


    http://chazmiller.com/projects/pinmeter.html
    Cool!
    Regards

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

  3. #13
    Steve Smith's Avatar
    Join Date
    May 2006
    Location
    Ryde, Isle of Wight
    Shooter
    Medium Format
    Posts
    8,587
    Images
    122
    Quote Originally Posted by RalphLambrecht View Post
    Lux and nits (candela/m^2) not lumen, but why don't you just record EVs? Most lightmeters measure in EVs.
    Shouldn't that be LV for light value? My understanding is that EV is exposure value and is a combination of shutter speed and aperture Whereas LV is an actual light value.

    EV only being equal to LV at EI 100.



    Steve.
    "People who say things won't work are a dime a dozen. People who figure out how to make things work are worth a fortune" - Dave Rat.

  4. #14

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Ray - your Minolta incident meter when equipped with a flat diffuser disk will make Lux readings. It reads in EV and then your meter manual should have a conversion table and the formula. My Flashmeter IV does this.
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  5. #15

    Join Date
    Jul 2007
    Location
    Netherlands
    Shooter
    Medium Format
    Posts
    5,686
    I'm not sure this is what you are after, but i have used Gossen Profisix and Lunasix F meters to do something similar on days when clouds raced across the sky.
    Measured, zeroed the needle, locked the meter's on button, and watched the needle move to see when light levels were up to the measured value again and/or how much under or over the light at any moment was.
    Worked fine, though not very battery friendly.

    Should work fine with any meter that has a "constant metering" mode.

  6. #16
    Lee L's Avatar
    Join Date
    Nov 2004
    Shooter
    Multi Format
    Posts
    3,244
    Love google, it came up with the one I recalled as the first result, searching on: pinhole integrating light meter

    http://www.ringsurf.com/tv/905252-in...er_driver.html

    Lee

  7. #17
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    the villages .centralflorida,USA and Germany
    Shooter
    Multi Format
    Posts
    6,428
    Images
    1
    Quote Originally Posted by Steve Smith View Post
    Shouldn't that be LV for light value? My understanding is that EV is exposure value and is a combination of shutter speed and aperture Whereas LV is an actual light value.

    EV only being equal to LV at EI 100.



    Steve.
    Steve

    Yes, EV for a given film speed is the better idea.
    Regards

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

  8. #18

    Join Date
    Aug 2005
    Location
    Earth
    Shooter
    Multi Format
    Posts
    1,560
    Quote Originally Posted by Lee L View Post
    Love google, it came up with the one I recalled as the first result, searching on: pinhole integrating light meter

    http://www.ringsurf.com/tv/905252-in...er_driver.html

    Lee
    Lee;

    Yes. Thanks. Actually I found the long discussion made during it's development and was reading through the years... unfortunately things seemed to die down around 2007, I am waiting on a response at the moment.

    Kirk, Q.G.;

    Yes, but as you may have guessed, that only tells me what the Light intensity WAS for an instant in the past. During the exposure we usually just cross our fingers (or, if we're printing and lucky, perhaps we have a voltage stablizer)

    Kirk;
    Thanks for reminding me! I did find a conversion chart on the internet and that will help me if I find I can't find the manual any more.

    Ray

  9. #19
    nick mulder's Avatar
    Join Date
    May 2005
    Shooter
    8x10 Format
    Posts
    1,204
    Images
    14
    Quote Originally Posted by Q.G. View Post
    I'm not sure this is what you are after, but i have used Gossen Profisix and Lunasix F meters to do something similar on days when clouds raced across the sky.
    Measured, zeroed the needle, locked the meter's on button, and watched the needle move to see when light levels were up to the measured value again and/or how much under or over the light at any moment was.
    Worked fine, though not very battery friendly.

    Should work fine with any meter that has a "constant metering" mode.
    Yup, but you need a system that will tell you the area under the graph that this output is plotting over time ...

    An 'integrator'

    Should note that as long as you use the same scheme to collect the light 'intensity' (or whatever) units are a bit redundant with an integrator once its set up.
    Cleared the bowel problem, working on the consonants...

  10. #20
    nick mulder's Avatar
    Join Date
    May 2005
    Shooter
    8x10 Format
    Posts
    1,204
    Images
    14
    Bettersense has linked his project above - pretty much exactly what I described earlier. Heaps of work done for you right there !
    Cleared the bowel problem, working on the consonants...

Page 2 of 3 FirstFirst 123 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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