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Hello stackexchangers,

yesterday i had my first portrait shooting in a studio. I already had preimagined my lighting setup: a single softbox flash on the right for the general exposure and a big reflector on the left to soften and brighten up the depths. During the shooting however my liveview preview was almost pitch black, which is understandable when i use 1/60th, f2.2 on iso 50 in dimm lit studio. The only light source for the AF was a light through the softbox which was turned on when the flash wasn't firing.

Thankfully my Sony A7 III did an amazing job keeping track of the models eye to focus on. It seemed like it brightened up the liveview everytime i took an picture with prefocus on. I could most of the times could work the composition with the little time i had when the liveview exposure was increased during AF. All planned pictures of poses exceeded my expectations so everything turned out fine.

I think i should improve my workflow in this studio situation and realized i dont know enough of studio flash usage with my camera.

How can i preview the flash exposure and simultaneously use AF in liveview?

liveview preview actual exposed image

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  • Was selecting and locking a focus range ever an option? In controlled conditions you ideally also control the distance between subject and lens – Stian Yttervik May 3 at 7:35
  • you confuse me a bit with that statement. Indeed in a fully controlled situation i could control the distance. But wouldn't that imply i had to use a smaller aperture and increase the flash power, which then would lead to harsher shadows, i would have to counter with a greater distance from the subject? (the upper image is a test shot and not representative). While technically you're correct, that didn't seem to be a practical workflow in the situation. – TheDomis4 May 3 at 18:01
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Many cameras allow you to set your live display to "preview" or "framing". "preview" adjusts the brightness and depth of focus to match the expected photograph, "framing" is supposed to help with, well, what you were doing.

In a few of my cameras, "preview" effectively reverts to "framing" if you switch on flash mode (but not if you use "slow sync" in which case the flash is supposed to be more of a fill-in). What your camera does in which circumstance and whether there are controls for changing the mode of your display between "framing" and "preview", I don't know.

PostScriptum: from the manual of your camera available from Sony's web page:

1 MENU → (Camera Settings2) → [Live View Display] → desired setting.

Hint When you use a third-party flash, such as a studio flash, Live View Display may be dark for some shutter speed settings. When [Live View Display] is set to [Setting Effect OFF], Live View Display will be displayed brightly, so that you can easily check the composition.

That sounds like it should cover your use case.

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  • The auto adjust brightness (exposure preview off) also helps with autofocus; because the AF is using the output stream. But if it requires a lot of gain signal noise can degrade autofocus. – Steven Kersting May 2 at 19:36
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You simply cannot preview the exposure of light that does not exist at that moment. You had modeling lights on, which is about the best you can do.

You do not have to use such a dimly lit studio environment. But you do generally want to start with a dark frame exposure (or nearly). To help with AF/live view you could turn up the modeling lights if available (but "proportional" is usually the better choice), or bring up the room lights some and use a higher sync/shutter speed. You could also use a smaller aperture, if that was suitable for the desired image (often is for a studio pic); as long as you had more flash power available. And make sure exposure preview is disabled; otherwise you will see your dark frame exposure.

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    This is really the only correct answer so far, and I have upvoted it. I am totally stumped why someone else would choose to downvote this answer. – Mike Sowsun May 2 at 13:51
  • im curious: wouldn't the increased flash power also decrease the shadow softness (even when using a softbox?) I had assumend that a lower power flash leads to more indirect light, softening that shadows more. – TheDomis4 May 3 at 18:04
  • i think this answer is perfectly fine and technical correct. the selected answer has less technical background but does answer the question i asked better which was: "How can i preview the flash exposure and simultaneously use AF in liveview?" – TheDomis4 May 3 at 18:15
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    @TheDomis4, increasing the flash power will not increase the light hardness (shadow transitions) as that is controlled by size/distance. Nor would it affect the exposure/ratio/contrast because you would also increase the ambient/room light levels (so you can see and AF function), and both light level increases are offset by using a smaller aperture... what the camera sees/records remains the same. – Steven Kersting May 3 at 18:44
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Comments tell me my initial assumption was incorrect, but I'll leave it here, just in case.

You cannot use the rear screen on many cameras to preview exposure, as they auto-adjust to try to give a 'best view' in all lighting.


I'm assuming your softbox flash was a regular strobe light?

That's why the pros use studio flashes, which contain modelling lights. These let you see the general shape of the lighting before the shot is taken, and is also hugely useful to just be able to actually see in the room, and as something to help out auto-focus.
The idea is that the flashes almost completely overpower the modelling lights, so they don't really interfere with the end result.

Being in a similar position, I only have regular strobes, I often use video lighting squeezed in tight to the softboxes to mimic modelling light. It doesn't quite work, because you cannot achieve the exact same angles, but it's a reasonable close-approximation, for zero additional budget [as I have them anyway, for video].

I have considered trying to squeeze some small consumer LED spotlights, rear-facing inside the softboxes to better approximate my angles - but this is a project currently awaiting trial.

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    thanks Tetsujin for the really fast reply! Thats a really good idea you have there! The flashes had some sort of "preview" light that was on when the flash wasn't firing. I thought it was already bright enough for not running into someone in the studio :) I was wondering as my camera previewed me a really bright image (it propably just pushed iso) for when the AF was looking around. – TheDomis4 May 2 at 10:27
  • I'll add this to the answer - On many cameras, you can't use the rear screen to judge exposure, as they auto-adjust to be always visible. You could probably ramp up the modelling lights if they're available; they're usually adjustable. – Tetsujin May 2 at 10:36
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While technically my answer was answered by Tetsujin, i wasn't satisfied and digged a bit into it.

It seems i've had a misconception about the EVF because it obviously simulates the picture you're getting when pressing the shutter button. When using a flash, of it won't know anything of it and can't calculate that in.

There is however a workaround it seems: disabling live view in the EVF. doing this allows to see what the sensor sees, without using the dialed in exposure for my flash. As long as there is some light hitting the sensor, it helps alot on AF/Composition.

The Option is Called "Live View Display" and is located under "Display/Auto Review1" on my Sony A7 III.

Assigning a Button (i used C3) will then allow me to switch back and forth when necessary (on, when using the camera in natural light, off when in studio).

This does not eliminate the issue of "previewing the flash" but rather in combination with a small light source and some test shots it will be alot easier to make composition and focus adjustments, without touching the settings.

Thanks for all the answers!

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    Actually, what you disabled is exposure preview, called "settings effect" by Sony; mirrorless is always using live view (streaming output). – Steven Kersting May 2 at 19:26

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