Nikon D750: how to lock shutter in manual mode?

I'm a bit new to my D750 and baffled by one issue. When in manual mode, I cannot figure out how to keep the shutter speed constant. This is really a problem shooting flash. I'll set the aperture to (for example) f5.6 or f11 or whatever, and it stays put. Then I'll put the shutter speed on 1/200 to ensure proper flash sync. But after taking the shot, the shutter speed will jump to another setting without me doing anything. For example, I'll have it at 1/200 @ f5.6, click the shutter, flash goes off and everthing's fine. But for the next shot, the shutter speed might will have jumped to, say, 1/4000, or 1/80, or anything entirely random. Obviously if it goes higher than the shutter sync speed, I lose the shot. So I have to check every single shot to ensure the shutter speed is back down within sync range.

I've searched the manual and cannot figure out if I've got some setting wrong... or if there's something wrong with the camera. Anyone else have this issue?

Thanks!

I assume that by manual you have turned the mode dial to the M setting. You are not in auto ISO and you have adjusted the speed and aperture to what's needed using the front and back control dials.

Your settings are then shown in the top control panel.

You then open the flash by pressing the flash button and take the shot.

According to your post the top panel then shows the speed has changed. If this is the case I have no idea how its changing, as if the mode dial is locked into manual you physically have to move the speed control dial to change the speed.

As an aside 1/200 is not the correct sync speed. 1/200 refers to the fastest speed the camera can be set to use the flash. The flash will sync at any speed up to 1/200.

If you wish to take flash pictures faster than that then set auto FP and use an appropriate flash unit.

Push the 'BKT' button on the left side near the lens. The small top LCD should read '0F' if bracketing is off. If not, turn the rear dial until it does read '0F'.

Thank you so much! I've spent an hour trying to figure out how to get out of bracket mode then saw this from several years ago.

photographymo said:

Thank you so much! I've spent an hour trying to figure out how to get out of bracket mode then saw this from several years ago.

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Right. I didn't even know my D750 had a BKT button until it happened to me.

I just made an account just to tell you that you are an absolute LIFESAVER!!
I had the same problem and was honestly going to give up on the camera, so thANK you so so much!

Haynako said:

I just made an account just to tell you that you are an absolute LIFESAVER!!
I had the same problem and was honestly going to give up on the camera, so thANK you so so much!

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Does anyone ever read their camera manual ?

D750 is a complicate camera and Nikon have provided you with a 501 pages manual, at least read and learn the basic. Compares to my F3 it came with a 16 pages booklet.

I have Nikon Manual Viewer 2 on my phone - download the PDF manual free from Nikon website to your phone - as many camera manuals as you need.

I know it's years later but thank you so much! I am just getting into photography but I had started with a Nikon D5000 and did not have this problem until I purchased the D750, however, it aggravated me that I read the manual over and over again and still could not find the solution to this problem, you're the best!

Thank you to those who actually answered the question instead of complaining about us checking the manual. Much appreciated.