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Thread: Through the lens metering

  1. #11

    Re: Through the lens metering

    Tapatalk appears to only accept one photo at a time

    Sent from my SM-T210 using Tapatalk

  2. #12

    Re: Through the lens metering

    Quote Originally Posted by john.l.barford View Post
    Tapatalk appears to only accept one photo at a time

    Sent from my SM-T210 using Tapatalk
    I am seriously unimpressed with tapatalk

    Sent from my SM-T210 using Tapatalk

  3. #13

    Join Date
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    NJ
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    Re: Through the lens metering

    Quote Originally Posted by ic-racer View Post
    Since you responded, what is your "relevant" technique? Something that falls outside of empiric physics like most of your posts?
    Why do the calculations when meter, shoot, develop, measure film density will do?

    I'm all for models and using them but direct measurement is, well, more direct.

  4. #14
    Drew Bedo's Avatar
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    Oct 2006
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    2,403

    Re: Through the lens metering

    Yes . . .please publish the Meter info.

    I fooled around with this years ago trying to use photo cells from Radio Shack and a multimeter. Mounted ity all to a film holder (lots of Epoxy putty) and tried it out. Lack of linearity and other things lead me to realize that I didn't have the electrical engineering backround to get this done . . .and dropped the project.
    Drew Bedo
    www.quietlightphoto.com
    http://www.artsyhome.com/author/drew-bedo




    There are only three types of mounting flanges; too big, too small and wrong thread!

  5. #15

    Re: Through the lens metering

    Through the lens metering .
    To make this meter you will need.
    1) A LUX METER. Plenty of these on e bay. You will need one where the sensor head is seperate from the meter joined to it by curled wire.
    2) a solar cell roughly 4x5 inches (plenty of these on e bay)
    3) an old 4x5 film holder
    4) bits of wire

    Glue the solar cell into the film holder.
    Cut sensor off lux meter
    Wire lux meter to solar cell
    Put film holder in camera
    Test
    Match readings on lux meter to light meter readings
    And type up conversion table.

    Sent from my SM-T210 using Tapatalk

  6. #16

    Join Date
    Dec 2001
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    Re: Through the lens metering

    Cute. How well does it work in dim light?

  7. #17

    Re: Through the lens metering

    It is able tto cover all exposure values (EVs) from 1 to 16

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  8. #18

    Join Date
    Jun 2016
    Posts
    13

    Re: Through the lens metering

    Out of interest, how would having the lux meter behind the lens account for shutter speed? I understand you could set the desired aperture then open the shutter on bulb to get a lux reading but what conversion would you apply to get ISO/shutter?

  9. #19
    (Shrek)
    Join Date
    Mar 2011
    Location
    Montreal
    Posts
    1,644

    Re: Through the lens metering

    Quote Originally Posted by john.l.barford View Post
    Through the lens metering .
    To make this meter you will need.
    1) A LUX METER. Plenty of these on e bay. You will need one where the sensor head is seperate from the meter joined to it by curled wire.
    2) a solar cell roughly 4x5 inches (plenty of these on e bay)
    3) an old 4x5 film holder
    4) bits of wire

    Glue the solar cell into the film holder.
    Cut sensor off lux meter
    Wire lux meter to solar cell
    Put film holder in camera
    Test
    Match readings on lux meter to light meter readings
    And type up conversion table.

    Sent from my SM-T210 using Tapatalk
    FYI, any voltmeter will do if it's accurate in the 0-1.5V range. But an accurate volt meter might cost more than a cheap lux meter from China. Also, you could mount a smaller photovoltaic cell on a thin piece of spring steel, then you would have a through-the-lens 'spot' meter that will read specific areas of interest, that you can position by sliding it about in the holder.

  10. #20

    Re: Through the lens metering

    To calibrate the through the lens meter
    I suggest that at first you use the lux meter
    (before you chop off the end) and print out a LUX to EV conversion table from the net. Use the lux meter as an exposure meter and familiarise yourself with converting its readings to exposure values you are happy with.
    Make the through the lens meter. the readings from this will not be the same as the lux meter they may be bigger or smaller this does not matter. For example the lux meter will read between 320 and 640 for an exposure value (EV) between 7 and 8 . If the through the lens meter reads, say, between 1280 and 2560 (too high) simply move all the lux readings on your table down a place.
    Hope this helps

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