Low light 'catch in focus'

Am I right in thinking that 'catch in focus' will not work in low light?
I presume that the af assist lamp doesn't work with manual lenses:

Regards
Chris

Why not? All that's happening is that the AF system is working to confirm a focus point. I'd give it a try and see what happens.

yes the catch in focus does work in low light but slows your working down... Never worked with focus light so can't tell you..

Sometimes it does, sometimes it doesn't - It's f stop dependent too if you have a -k, -m etc lens (I can't get much with it above f/5.6 in low light). Can't rely on it.

Thanks everyone.
It seems a bit hit and miss in low light.

Regards

Chris

How does the autofocus actually work?
I've read on other systems (buying my son a Fuji bridge camera) that it has something to do with contrast. That being the case, then maybe when light levels are too low there just isn't enough contrast for it to "see" when an object is in focus.

Or am I way off the mark?