Camera Light Metering Basic to Advanced Pt.2 - Duplex Metering

[@moosekatdeluxe]

Thanks for these videos. Really helped me to understand.

[@node547]

Apart from outside sun, this is also useful in interiors with spot lights in the ceiling pointing directly downwards.

[@PictorialPlanet]

Great comment! Thank you, Koen!!

[@AndrewVincent-b8w]

Please could you clarify what you mean by 'flattening' thew invercone. I have older meters and flattening may not be a function available to me or, are you simply removing the cone and using the meter as in reflective metering? Love the series. Many thanks, Andrew

[@PictorialPlanet]

Pop me an email my friend

[@seandwyer3598]

John-would you mind sharing the maths you used to establish your average? What number would you use to represent 1/8? .125? Also-received and am enjoying your book!

[@PictorialPlanet]

Hi Sean. Thanks for buying my book! Let me explain that averaging of those meter readings. 1. First reading 1/8s @ F11 (let's convert that to F8 to simplify, so 1/15s @ F8) 2. Second reading 1/250s @ F8 3. That's a four stop difference from 1/15s to 1/250 (both now F8). The stop calculation is 1/15-1/30-1/60-1/125-1/250 = four stops. 5. So, two stop up from 1/16 (or two stops down from 1/250) = 1/60s F8. This is our average of our two meter readings. Hope that makes sense.

[@photozen8398]

@@PictorialPlanet Great explanation helps a lot….thx.

[@nazahamed5860]

⁠​⁠I’m using traditional lightmeter, the Sekonic L-398, just one question regarding average the 2 readings, what if there’s 3 stop’s difference say at f.8, 1/30 - 1/60 - 1/125 - 1/250, how do I set the camera setting?

[@leonardobaldenegrodiaz4503]

I definitely didn't understand how I got the final exposition, I think I understood how I got the two readings, but not the final one. Can someone or the same instructor explain it to me?

[@PictorialPlanet]

First reading 1/8th@f11 (1/16@f8). Second reading 1/250@f8. Then get the average. There's 4 stop's difference so the average or middle is 2 stops which is 1/60@f8. Set the average 1/60@f8 on the camera.

[@leonardobaldenegrodiaz4503]

@@PictorialPlanet Thanks a lot for ur answer.

[@alastairstuart6062]

The Duplex metering initially seemed like a brainwave, but then I started to doubt the logic of it working in differing situations. Would you need to use it at all if the rose petals were not translucent? Is the technique related to the translucency of the petals or is that a red herring? Are you assuming the light transmitted through the petals is equal to what they would reflect. I can see that the result you achieved sets at two stops down, shadows areas illuminated solely from behind the camera; and sets at an EQUAL amount (two stops) up, areas in full sunlight (disregarding any specular component). This is starting to make more sense, if I disregard the translucent petals. Secondly, as regards using the invercone in the retracted position, does this not mean the angle the sun is coming from makes a big difference, regardless of how much light travels through the petals.

[@PictorialPlanet]

The petals being translucent has nothing to do with this technique (but adds the the photograph don't you think?) No, this is all about balancing the exposure, just as one would in the studio with multiple flash units. As common as it is in the studio people forget that it's just as useful out and about :)

[@alastairstuart6062]

@@PictorialPlanet Thanks for such a prompt answer. I will give it a try. The translucent petals seemed to be the raison d'etre of the picture, which is why I thought they must be relevant to the metering.

[@michaeltuffin8147]

You should have shown an example of each.

[@PictorialPlanet]

Sorry Michael

[@myblueandme]

So basically you put the shadows on the zone 7 and highlights at zone 4

[@PictorialPlanet]

Now that would be something!