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  1. #1
    bhursey's Avatar
    bhursey is offline The Geeky Photgrapher
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    Default Just tested my flashes with results I was not expecting

    Ok so I have always wondered what exact equivalent my flashes were because I shoot really a mixed bag of flashes. I thought this would give me a rough estaminet on how to use my setup in the future.

    My friend let me barrow his Polaris flash meter to test this and I am in an way excited with the results and in an way surprised. Note this was not a scientific exact setup.

    This is not direct flash power or anything and no I did not test the different zoom settings because I was on my lunch brea and personally I don't care because I was doing it just for me in my real world setup.

    In the real world I shoot my flashes normally into an bounce umbrella at like 5 - 6 feet. at 24mm zoom setting into an 43 inch convertible umbrella.

    I tested at 100iso 1/250 normally I shoot anywhere from 100iso to 800 iso. I normally start at 400 iso but I wanted to get the fstops full power at 100iso and the max shutter speed. my camera goes to with strobes.

    All were shot at full power.

    There are a total of 9 ticks and I believe 3 ticks = 1/3 it looks like

    Nikon SB-24: f5.6 and 1 tick
    LumoPro LP160: f4.0 and 6 ticks
    Canon 580EXII: f5.6 and 6 ticks
    Yongnuo YN 568EX: f5.6 and 4 ticks
    YN568EX+580EXII+SB24 on tri bracket: = f8.0 and 9 ticks
    YN568EX+580EXII+SB24+ LP160 on quad bracket: = f11 and one tick

    Large softbox direct...
    AlenBee AB400 at full power: = f8.0 and 9 ticks.

    This is what the quad setup looks like. For the tri bracket just remove the bar and put a flash in the middle.

    Mixed Mashed quad bracket.

    What do you all think of the results of my tests?
    Cameras: Canon 60D, Canon 20D, 35mm Nikon FM2n
    Canon EF lens used : 50mm f1.8, 18-55mm f/3.5-5.5, 75-300mm f/4.5-5, 85mm f/1.8
    Tamron Lens: 28-75mm F/2.8 XR Di LD Aspherical (IF)
    Strobist: Canon 580EX II , "Vivitar DF400MZ, Nikon SB-24, LP-160, YN568EX"
    http://flickr.com/photos/bhursey | http://brianhurseyphotography.com

  2. #2
    i speak in math's Avatar
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    What result was unexpected? They all look about right to me.
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    sk66's Avatar
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    I am lost..."3 ticks" what is a tick other than a nasty bug? =1/3 what? EV? + or -? The apertures and adjustments are all over the place..if you open the aperture you will have to reduce the power for equivalent exposure...
    I'm just not understanding what you were doing or why. F/4-2/3 would seem to be very close to f/5.6-1/9...
    Last edited by sk66; 01-17-2013 at 04:49 PM.

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    i speak in math's Avatar
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    Quote Originally Posted by sk66 View Post
    I am lost..."3 ticks" what is a tick other than a nasty bug? =1/3 what? EV? + or -? The apertures and adjustments are all over the place..if you open the aperture you will have to reduce the power for equivalent exposure...
    I'm just not understanding what you were doing or why. F/4-2/3 would seem to be very close to f/5.6-1/9...
    I think he means tenths of EV for ticks. Like 5 ticks would be 1/2 stop.

    And he's measuring the light output of the flashes, not changing apertures on his camera
    My Portfolio | My 500px | My Photo Blog | My Picasa Albums
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  5. #5
    bhursey's Avatar
    bhursey is offline The Geeky Photgrapher
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    Found out a tick was 1/10th a stop.. Basically what was surprising to me was that the LP160 568EX was advertised generally to be as powerful as the 580EXII or the SB900. Now I never trust guid numbers hence the test. The results of the LP160 was extremely surprising. After testing all my flashes it seems the least powerful at real world portrait setup test. I tested also my 80$ DF400MZ my first flash which I thought was under powered and it tested better than the LP160. Now if you zoom them all the way in have no clue but the majority of the time I use them is bounce in an umbrella. I also was surprised at the tri bracket results being the same as the AB400. I mainly did this test to know what I had to work with and what best to use in certain situations and what flashes to use in combination.

    Nikon SB-24: f5.6 +1/10th a stop
    LumoPro LP160: f4.0 +6/10th a stop
    Canon 580EXII: f5.6 +6/10th a stop
    Yongnuo YN 568EX: f5.6 +4/10th a stop<-- December 2012 batch
    Vivitar DF400MZ f4.0 and 9/10th a stop

    Large softbox direct...
    AlenBee AB400 at full power: = f8.0 + 9/10th a stop

    And yes measuring the light output of the flashes. Flash meter was set at 100iso and 1/250 shutter speed. So that gives you what the flash would be able to get at that to get a proper exposure.
    Last edited by bhursey; 01-17-2013 at 05:33 PM.
    Cameras: Canon 60D, Canon 20D, 35mm Nikon FM2n
    Canon EF lens used : 50mm f1.8, 18-55mm f/3.5-5.5, 75-300mm f/4.5-5, 85mm f/1.8
    Tamron Lens: 28-75mm F/2.8 XR Di LD Aspherical (IF)
    Strobist: Canon 580EX II , "Vivitar DF400MZ, Nikon SB-24, LP-160, YN568EX"
    http://flickr.com/photos/bhursey | http://brianhurseyphotography.com

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    scootermcq's Avatar
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    I'm a little surprised by the lack of output. I can get two SB600's to give me f11 at ISO 100 using a shoot through umbrella from 5'
    Scott
    Nikon D700, D300, 50mm 1.8, 85mm 1.8, 105mm f2.8, 28-75 f2.8, 35-70 f2.8, 80-200 f2.8

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    Rentham's Avatar
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    Interesting. I have a few LP160s and a 580 EXII. I'll see if mine exhibit the same.

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    inkista's Avatar
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    Quote Originally Posted by bhursey View Post
    ... Basically what was surprising to me was that the LP160 568EX was advertised generally to be as powerful as the 580EXII or the SB900.....
    I keep seeing this stated over and over, and it's wrong. It's always been wrong. People accept the spec. guide number, and think they're comparing apples to apples, without understanding how zoom works and can cheat the guide number. The LP160 and Yongnuo 5xx flashes have always been around the SB-600 or 430EX in output. The speedlights.net testing (similar to yours, only the aperture settings were then converted to guide numbers) pretty much proved it to me. They tested everything @35mm zoom.

    Last edited by inkista; 01-17-2013 at 08:23 PM.
    I shoot with a Canon 5DmkII, 50D, and S90, and Pansonic GX-7. flickr stream and equipment list

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    bhursey's Avatar
    bhursey is offline The Geeky Photgrapher
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    Quote Originally Posted by Rentham View Post
    Interesting. I have a few LP160s and a 580 EXII. I'll see if mine exhibit the same.
    I tested at 24mm full power however I realized something I had the spreader cap on it that I think puts it at 14mm. So can you check to see if im right in that the difference is a full stop of light between the two?

    The way I set up was 43 inch bounce convertible white umbrella with the black cover on it at 6 feet toward the light meter. I gave the meter back so I can not re test without the cap. I always leave the cap on it so I did not think about that.
    Cameras: Canon 60D, Canon 20D, 35mm Nikon FM2n
    Canon EF lens used : 50mm f1.8, 18-55mm f/3.5-5.5, 75-300mm f/4.5-5, 85mm f/1.8
    Tamron Lens: 28-75mm F/2.8 XR Di LD Aspherical (IF)
    Strobist: Canon 580EX II , "Vivitar DF400MZ, Nikon SB-24, LP-160, YN568EX"
    http://flickr.com/photos/bhursey | http://brianhurseyphotography.com

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