My camera seems to need more light

[LefflerHirthe]

I have a Canon XTI. I have had since 2005ish. Recently it seems like it needs more light to properly expose a photo and is just generally unreliable. I can be in the same room and take many photos and some will be ok and others are very dark and unsalvageable. Why would this happen? Thanks in advance.

[Ray-uk]

There are many reasons that this can happen, if you are certain that you have the camera set up correctly and it is not a case of "operator error" then the first thing to try is reset the camera to factory defaults ( this is in the camera menu ).

If the fault still persists then try using another lens, if that doesn't help then it must be a fault with the camera body.

[Waddizzle]

It could be the flicker from artificial lighting, fluorescents and LEDs.