D3s, Lo exposure warning oversensitive?
I need some wisdom on the "Lo" warning that shows up when exposures head toward long shutter speeds under aperture priority. I was shooting fireworks the other night and noticed that with an aperture of 8 to 11, the foreground I was interested in including gave a shutter speed of about 6-8 seconds. However, I needed to use M mode to find this out, because every time I set aperture toward the small side, the exposure indicators showed "Lo" starting at around 1/2 sec or so. I tried the same in my living room afterward by moving the field to include or exclude a nearby window in order to vary the light available and drive a range of shutter speeds. There it seemed that "lo" showed up at larger numbers, but nowhere near the correct setting that works, as revealed in M mode. What am I missing? There seems to be some arcane limits that do not make sense in A mode. Why does it not show the entire range of shutter speeds, out to 30" for a given aperture? (I could not find an explanation in the manual)
Thanks for any help.