I have a most vexing problem.
I have a Nikon d5100 (roughly a year old) which up until two days ago handled exposure and metering just fine. However, at night, in a well lit room (florescent bulbs) in which I NEVER had problems capturing images at reasonable shutter speeds, apertures and ISOs (< 400), here's what's happening now:
- In Manual, even at low shutter speeds (1/90 and lower) and relatively open apertures (3.5) - ISO 640 and less - my pictures are almost completely black. Pointing the camera at a bright lightbulb just barely captures the light with heavy shadows all around it.
- Exposure compensation no longer has ANY effect on the exposure
- Shooting in Aperture Priority mode at f/3.5 at anything lower than ISO 1000 reduces my shutter speeds to 1/2 or lower to compensate.
Yes, I know. ISO. Keep in mind, the room is quite brightly lit and I never had this issue prior to last night. That being said, the only way I can capture a reasonably exposed picture here is at ISOs 6400 and above. But even a picture at 1/125, f/5.6, ISO 6400 (manual) is still ridiculously dark.
I have taken the following step to troubleshoot, to no avail:
- Turned exposure compensation up to the max +5.0 - no effect
- Turned shutter speeds down to 1/40 and below - extremely limited effect
- Turned ISO up to 6400 and beyond - limited effect
- Update the camera's firmware (1.01 > 1.02) - no effect
- Reset the camera using the buttons with the two green dots - no effect, multiple tries
- Messed with the metering modes - no effect
- Turned it off and on again - no effect
- Stared pointedly at the camera - camera didn't even flinch
I am at an absolute loss here and I really, truly, need help.
ISO 100, f/3.8, 1/3
ISO 100, f/3.8, 1/90
ISO 1000, f/3.8, 1/90