Long Exposure Noise Reduction

For everyday photography, should the "Long Exposure Noise Reduction" facility be on or off?

I am a bit confused as to when this would be an advantage.

I would say off.

What it does is take a second blank exposure of the same duration in order to generate the noise profile.

Shooting everyday objects it will wither have no effect or will double your exposure time

neilwood32 wrote in post #10784256
I would say off.

What it does is take a second blank exposure of the same duration in order to generate the noise profile.

Shooting everyday objects it will wither have no effect or will double your exposure time

Thanks for your reply. It wasn't until I read a post in reply to someone with a query regarding photographing stars that I decided to check my camera, it was then that I found mine on. I must have set it when I first bought the camera last December.

The long exposure NR only functions during specific exposure lengths.

I like it's like 5 second - 1/5th...

Honestly, I end up running with my long exposure NR on all of the time, but I think that's because pretty much the only time I take long exposures is for my landscape photos, and I'm just not concerned with a few more seconds of exposure time. . .for that matter, I specifically want it on for these photos. So, since 99.9% of the time it doesn't kick in until I actually want it, I'd rather leave it on than risk forgetting it when I really want it. It's certainly a personal preference, though.