What equipment to use to make liquid oxygen? I'd like to do some experiments with liquid oxygen but as a first step I'll have to make some. Unfortunately I don't have any experience designing cryogenic experiments. I'm thinking I'll cool gaseous oxygen using liquid nitrogen as the coolant and then I want to collect the liquid oxygen condensate in a small dewar of some kind. 

It needs to be high purity so I'll be using 99.9% purity "scientific grade" oxygen from a cylinder.

Does it make sense to use conventional condenser glassware like a dimroth condenser for instance? Alternatively what's the best equipment to use and what's the best way to rig a cryogenic setup like this? 

Also what safety precautions should I take?
Simply put an open flask in the LN2 and it will fill with liquid oxygen from the air. 

Or better: DON'T DO THAT!! What the heck do you want with it?!?

LO2 is highly dangerous. If it comes in contact with anything combustible, it will blow up vigorously. Together with lab solvents, it will likely explode. Make sure the flask or dewar is dead clean. 
Chemistry is science, and science is about prediction. If you cannot predict, from knowledge, not hearsay, what your experiment will likely do, don't do it.