I can't enable Multiple Exposure

I am struggling with the problem on my Nikon D750 when trying to enable Multiple Exposure.

I used it at some point in the spring, and got to liking it, so trying to do projects with it, but suddenly something happened and it is disabled.

Trying to enable it at various settings in a camera, I get the error message like this

"This option is not available at current settings or in the camera's current state"

I tried at different settings, I did "reset shooting menu"

All the different settings are tried are those that I usually / always use. It is very unlikely that when it worked, I was at some setting that I do not use usually.

Can anyone help ?

Are you possibly set on Auto? It grays out there, works in M,A,S,P. Just tried it in A - interesting, not a feature I had used before.

Detailed info p 216 in the camera manual.

Are you possibly set on Auto? It grays out there, works in M,A,S,P. Just tried it in A - interesting, not a feature I had used before.

Detailed info p 216 in the camera manual.

Yes, of course, I tried in all the settings. And I do not use 'Auto' - mostly manual and 'A' and 'S'.

However, could it be that some settings, defaults everything to 'Auto' somewhere ?

So, Yes. It was some settings. I went through all the screens, and reset all the custom menus everywhere.

Now, I gut the multiple exposure working. Unfortunately, I still can't tell what caused the problem :( And it is likely i might turn those setting on again, and I won't know what it was

In cameras as with software on computers, "There are more things in heaven and earth, Horatio, than are dremt of in your philosophy."

So, Yes. It was some settings. I went through all the screens, and reset all the custom menus everywhere.

Now, I gut the multiple exposure working. Unfortunately, I still can't tell what caused the problem :( And it is likely i might turn those setting on again, and I won't know what it was

Assuming it is only one setting that prevents multiple exposure (and that is a big assumption), find it with a binary search.

1) Reset the camera.

2) Set half the settings to where they were when multiple exposures failed.

3) Try multiple exposure. If it fails, it is one of those settings. If multiple exposure works, it is one of the setting in the other half.

4) Reset the camera and set the other half of the settings.

5) Try multiple exposure. It should fail. If it does not then a combination of settings is causing the problem and you have a long search ahead of you.

5) If it fails, reset half the setting. and try again. If not, reset and set the other half of the setting and test

6) If it fails reset half of the remaining settings and try again.

7) Keep halving the setting until one one remains and multiple exposure fails with it set.

You will need no more the Log (base 2) of N tries where N is the number of settings: .An example if there are 32 setting you will need no more than 5 attempts to find the failing setting.

Good luck.

Another way, if you have a good memory, what were the last settings you changed between the last time multiple exposure worked and when it did not. .

I wonder if there's anything to be found in EXIF?

Most settings are in there somewhere!

Look at a BEFORE image when it worked OK and one AFTER it got messed up.

An interesting thing you can do with a double exposure is to enhance shadow detail with a 'flashing' exposure.

You take a shot of an out-of-focus and evenly lit sheet of paper at a very low exposure, then use that as a double exposure to take your high-contrast subject.

It gets you about one extra stop of shadow detail if you get the flashing exposure right, but it's easy to overdo it and just get grey shadows.

'Flashing' used to be a fairly common technique for apparently boosting the speed of film. It's interesting to play with the technique in digital, but whether it has any practical value; I'm not sure. Especially since it takes a while to set up, and then you only get a 30 second window to use the flashed frame before double-exposure is automatically cancelled.

Maybe you could offset blue shadows with a sheet of yellow paper?

Oh damn! Now I've set myself another experiment to try out.