Its easy to notice when your IR cut filter is stuck open during the day. The purplish tinting in the image is easily identified. From a recent discussion. (Left panels are stuck).
But what about if your cut filter is stuck closed at night?
How would you know? Especially, if you weren't using IR lightning and even more especially if the filter had never opened from the day you bought it.
I could imagine just thinking this camera sucks in low-light and writing it off as such. It might not even suck that much depending on the ambient light around.
If they can get stuck open then they can get stuck closed, I would think.
Thoughts?