jbouchard Online Upload & Sell: Off
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What flash are you using? That could be relevant.
I expect your D750 works like my D700 when you aren't in AUTO mode. On my D700 when I turn on my SB700, or any flash AFAIK, it works like this...
- the AUTO ISO automatically goes down to my preset ISO, effectively disabling auto ISO.
- my shutter speed is automatically changed to 1/60 as a sync speed (changeable, but that's default)
- Since I'm in Aperture preferred mode (A) 98% of the time, the aperture is what I've set it to, like f2.8.
- Now my ISO, shutter speed and aperture are all chosen, regardless of how light or dark the setting is.
- The only variable left is the TTL system in the body/flash, which will throw as much light as it needs to when the photo is being taken.
- So, what's my exposure meter doing during all this? It does what exposure meters do... it shows me if I'm going to underexpose or overexpose with these settings and ambient light. It has no idea what the flash is going to do, so that doesn't enter the equation.
- If it's showing overexposed then that means ambient light is too bright for my settings, and I have to make an adjustment, or it will definitely overexpose.
- If it shows underexposed, that tells me what my ambient to fill-flash ratio is going to be like. If it's -1, then I'll have a nice bit of fill flash. If it's pegged on the negative side, it's going to be "mostly flash" and potentially a very dark background. I can change my settings if I like.
- BTW, I typically use "center weighted" and "aperture preferred" rather than "matrix" and "program" because I'm frequently using Ai lenses. Then even if I'm using CPU lenses, I leave it there because it's easier than switching back and forth.
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