How do you toggle Constant Preview ON/OFF with a flash installed on S1/S1R/S1H?

[Mick H]

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I would like to judge ambient exposure only by turning off constant preview.  When I have a flash installed on my S1H, I cannot turn off constant preview on the camera.  I can only turn the flash off to override it to judge ambient light only.  Thanks.  

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[Mick H]

I assigned "Preview" to an FN button.  When shutter speed effect is turned on, then I get the ambient only preview with a flash installed and turned on.  The "Constant Preview" function will not toggle ON/OFF with the flash turned on.  

[jaapv]

It appears to me to be quite logical. When using flash an exposure preview will not have any validity and the viewfinder will be too dark to see anything b

[Mick H]

7 hours ago, jaapv said:

It appears to me to be quite logical. When using flash an exposure preview will not have any validity and the viewfinder will be too dark to see anything b

Exposure preview is valid for me to assess/adjust the brightness of ambient light alone before mixing flash with ambient for outdoor portraits for instance.  In studio, I use my SL with strobes and I reduce ambient light to total darkness in that case.  

[jaapv]

Yes, but an EVF is completely unreliable for judging exposure. There is the histogram for that purpose. 

[Mick H]

The EVF gets me close as I have highlight clipping turned on.  I evaluate images as I shoot.

[jaapv]

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So do I-by having the histogram in the EVF. 

[Sandokan]

If what Mick H wants to do is what I think he wants to do - which is for the screen/viewfinder to show the view in a studio when set at 1/180s @f8 when the normal light intensity would have 1/4s @f8; is to set CONSTANT PREVIEW to OFF (settings menu, 6th one down and then sub menu)

But re-reading original post, I have no idea what you mean or want to do?